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* Son Goku in ''Manga/{{Saiyuki}}'' was been imprisoned in a rock for 500 years without aging before being freed by Sanzo. Goku's apparent age is supposed to be 18, but he looks 12. Might have to do with the fact he's not a normal being but what's termed a "Heretic" (as in one note created according to the rules of the Heavens). His true (unbound) form looks noticeably older but not by much.
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* Son Goku in ''Manga/{{Saiyuki}}'' was been imprisoned in a rock for 500 years without aging before being freed by Sanzo. Goku's apparent age is supposed to be 18, but he looks 12. Might have to do with the fact he's not a normal being but what's termed a "Heretic" (as in one note not created according to the rules of the Heavens). His true (unbound) form looks noticeably older but not by much.
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* Son Goku in ''Manga/{{Saiyuki}}'' was been imprisoned in a rock for 500 years without aging before being freed by Sanzo. Goku's apparent age is supposed to be 18, but he looks 12.
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* Son Goku in ''Manga/{{Saiyuki}}'' was been imprisoned in a rock for 500 years without aging before being freed by Sanzo. Goku's apparent age is supposed to be 18, but he looks 12. Might have to do with the fact he's not a normal being but what's termed a "Heretic" (as in one note created according to the rules of the Heavens). His true (unbound) form looks noticeably older but not by much.
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* In ''Manga/{{Pandora Hearts}}'' The Baskervilles all have natural abilities that make them live for a long period without really aging along with naturally resistant. However,[[spoiler: the majority of the cast is also over 100 years old, living during the Tragedy including Break, Oz, Vincent, Jack and Gilbert who then goes on and [[IWillWaitForYou waits ANOTHER 100 (and 15) years for Oz]][[DevotedtoYou to reincarnate and return to him.]] ]]
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* Shinobu from Monogatari looks to be about 8 but used to actually look a lot older. Even so, she still looked a lot younger than the 500 years old she actually is.
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* Shinobu from Monogatari looks to be about {{VisualNovel/Bakemonogatari}} and its followups has the appearence of an 8 year old, but used to actually look a lot older. Even so, she still looked a lot younger than the in reality is over 500 years old she actually is.old. She looked older when [[spoiler:she was a full vampire]] but ''still...''
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*** Old Supreme Kai takes the cake here, as he's ridiculously old even by Kai standards. He actually does look pretty old, but he counts his age as "15 generations". Logically, he'd be talking about ''Kai'' generations. Considering that Eastern Supreme Kai has not visibly aged in 5 million years, this would be an [[TimeAbyss unbelievably long time indeed.]]
*** Furthermore, the age he's showing is not his own. He accidentally fused with an old witch when he was young, and has looked that old ever since.
*** Furthermore, the age he's showing is not his own. He accidentally fused with an old witch when he was young, and has looked that old ever since.
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***
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* ''Manga/FairyTail'': Zeref has the appearance of a teenager but is actually over four hundred years old due to being TheAgeless. [[spoiler:Mavis, having the same curse as him, had the appearance of a thirteen year old up until her "death" at age twenty-six]].
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* ''Manga/FairyTail'': ''Manga/FairyTail'':
** Zeref has the appearance of a teenager but is actually over four hundred years old due to being TheAgeless. [[spoiler:Mavis, having the same curse as him, had the appearance of a thirteen year old up until her "death" at age twenty-six]].
** Zeref has the appearance of a teenager but is actually over four hundred years old due to being TheAgeless. [[spoiler:Mavis, having the same curse as him, had the appearance of a thirteen year old up until her "death" at age twenty-six]].
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* This pops up in ''{{Main/Gate}}'' when the main characters from the Special Area are visiting Earth for the first time. After Rory, who looks about 13, is lectured by an ordinary human about respecting her elders, she reveals herself to be 961 years old, having stopped aging once she became a demigoddess. Tuka, who looks maybe 17, turns out to be 165, and as a fairy-type elf, may never experience old age. Subverted with Lelei, who, despite being a genius mage and acting far more mature than the other two, insists she's simply fifteen.
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* This pops up in ''{{Main/Gate}}'' ''Literature/{{Gate}}'' when the main characters from the Special Area are visiting Earth for the first time. After Rory, who looks about 13, is lectured by an ordinary human about respecting her elders, she reveals herself to be 961 years old, having stopped aging once she became a demigoddess. Tuka, who looks maybe 17, turns out to be 165, and as a fairy-type elf, may never experience old age. Subverted with Lelei, who, despite being a genius mage and acting far more mature than the other two, insists she's simply fifteen.
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* This pops up in ''{{Main/Gate}}'' when the main characters from the Special Area are visiting Earth for the first time. After Rory, who looks about 13, is lectured by an ordinary human about respecting her elders, she reveals herself to be 961 years old, having stopped aging once she became a demigoddess. Tuka, who looks maybe 17, turns out to be 165, and as a fairy-type elf, may never experience old age. Subverted with Lelei, who, despite being a genius mage and acting far more mature than the other two, insists she's simply fifteen.
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* Dragons, like Filia and Valgaav, and ''Mazoku'', like Xellos, are either long-lived or immortal in ''LightNovel/{{Slayers}}''; Xellos is well over a millennium old, Valgaav is shown to be at least as old as Xellos, while Filia is several hundred years old, but not as old as Valgaav (which is pointed out in the anime, when she is shown tidbits of Valgaav's childhood). While elves also live at least twice as long as humans do, some human sorcerers with a lot of magical power can live for a century or two. Finally, chimeras can live for ages or die quickly, something that was [[WordOfGod addressed by the light novel author]]. In theory, if [[JerkWithAHeartOfGold Zelgadis]] were to remain a chimera for the rest of his life, he could live for several hundred years.
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* Dragons, like Filia and Valgaav, and ''Mazoku'', like Xellos, are either long-lived or immortal in ''LightNovel/{{Slayers}}''; Xellos is well over a millennium old, Valgaav is shown to be at least as old as Xellos, while Filia is several hundred years old, but not as old as Valgaav (which is pointed out in supposed to be near adulthood at around 500 (the anime emphasizes the anime, difference when she is shown tidbits of Valgaav's childhood). While elves also live at least twice as long as humans do, some human sorcerers with a lot of magical power can live for a century or two. Finally, chimeras can live for ages or die quickly, something that was [[WordOfGod addressed by the light novel author]]. In theory, if [[JerkWithAHeartOfGold Zelgadis]] were to remain a chimera for the rest of his life, he could live for several hundred years.
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* One chapter of SayonaraZetsubouSensei shows a [[FlashForward brief glimpse fifty years into the future]] in which the former students have noticeably aged (Nami and Mataro are white-haired and wrinkled, Usui is almost completely bald, Kaede is shown in silhouette but has a granddaughter). Then there's [[spoiler: [[NightmareFuelStationAttendant Kafuka]],]] who hasn't changed. ''At all''.
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* One chapter of SayonaraZetsubouSensei ''Manga/SayonaraZetsubouSensei'' shows a [[FlashForward brief glimpse fifty years into the future]] in which the former students have noticeably aged (Nami and Mataro are white-haired and wrinkled, Usui is almost completely bald, Kaede is shown in silhouette but has a granddaughter). Then there's [[spoiler: [[NightmareFuelStationAttendant [[spoiler:[[NightmareFuelStationAttendant Kafuka]],]] who hasn't changed. ''At all''.
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* ''Manga/GateKeepers''' Houjou Yukino looks like a ten year old even though she's more than eight hundred years old.
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* ''Manga/GateKeepers''' Houjou Yukino looks like a ten year old even though she's more than eight hundred years old. The OVA [=GateKeepers 21=] reveals this is in fact the side effect of using her Gate of Ice: it "froze" her age.
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** [[spoiler: Though since they were brought forward through time travel and are probably the age they appear to be (uncertain on Natsu on account of him being technically dead for an unknown amount of time) it's likelier that they couldn't get through Fried's barrier because the dragons inside them were older than eighty]].
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Seto would be Tenchi's great-grandmother, not a great-great-grandmother, and a step one at that, since they have no blood relation.
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** Pretty much Tenchi's whole family aside from him. His sister who looks to be in her mid to late 20's is 80. His father is 200 and looks like he is in his early 40's. His Grandmother ([[BerserkButton whom no one should ever call her by that name]]) looks maybe mid 30ish and is well over 700 years old (As does his Grandfather, but he keeps a disguise up to make him look 60-ish). And his great grandmother looks to be in her mid 30's too. The parents of Azusa, emperor of Jurai, Tenchi's great-great-grandparents, show up in GXP and look to be in their 40's. Tenchi's other great-great-grandparent, Seto, shows up in the OVA and GXP and looks to be about mid 30's despite being 5,000 years old.
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** Pretty much Tenchi's whole family aside from him. His sister who looks to be in her mid to late 20's is 80. His father is 200 and looks like he is in his early 40's. His Grandmother ([[BerserkButton whom no one should ever call her by that name]]) looks maybe mid 30ish and is well over 700 years old (As does his Grandfather, but he keeps a disguise up to make him look 60-ish). And his great grandmother looks to be in her mid 30's too. The parents of Azusa, emperor of Jurai, Tenchi's great-great-grandparents, show up in GXP and look to be in their 40's. Tenchi's other great-great-grandparent, step-great-grandmother, Seto, shows up in the OVA and GXP and looks to be about mid 30's despite being 5,000 years old.
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** Hit from ''Anime/DragonBallSuper'' is over 1000 years old.
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** "I've loved you since the 900s." -Holy Roman Empire to Chibitalia.
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** "I've loved liked you for a very long time - since at least the 900s.twelfth century." -Holy Roman Empire to Chibitalia.
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* O.D from ''Anime/GatchamanCrowds'' is around (possibly over) three hundred years old, despite looking in their mid- to late-twenties.
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* Akasha Bloodriver from ''RosarioToVampire'' looked to be in her late twenties at the oldest... and looked exactly the same 200 years ago. Same goes for the other Dark Lords, though Fuhai plays with this a bit by having a SleepModeSize body that looks like a MiniatureSeniorCitizen.
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* Akasha Bloodriver from ''RosarioToVampire'' ''Manga/RosarioToVampire'' looked to be in her late twenties at the oldest... and looked exactly the same 200 years ago. Same goes for the other Dark Lords, though Fuhai plays with this a bit by having a SleepModeSize body that looks like a MiniatureSeniorCitizen.
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* The Nyan-Nyan (or Lai-Lai in the manga) from ''Manga/FushigiYuugi''. As goddesses, they don't age, and are as old as The Universe of the Four Gods itself, but they normally take the appearance of ''adorable'' little girls. At the end of the series proper, they ''do'' make an appearance as beautiful adult women (likely to symbolize that [[ComingOfAge Miaka has become more mature]]). And in the second OVA, one of them takes the form of a young teenage girl.
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* The Nyan-Nyan (or Lai-Lai in the manga) manga), a bevy of minor healer-goddesses from ''Manga/FushigiYuugi''. As goddesses, they don't age, and are as old as The Universe of the Four Gods itself, but they normally take the appearance of ''adorable'' little girls. At the end of the series proper, they ''do'' make an appearance as beautiful adult women (likely to symbolize that [[ComingOfAge Miaka has become more mature]]). And in the second OVA, one of them takes the form of a young teenage girl.
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* Cassian from ''{{Godchild}}'' is really thirty-five, but a medical condition caused his body to stop growing just before he hit puberty.
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* Cassian from ''{{Godchild}}'' ''Manga/CountCain'' is really thirty-five, but a medical condition caused his body to stop growing just before he hit puberty.
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** Then there's [[spoiler:Meliodas, who also looks like a kid, but is a demon over 3000 years old. He's lived through the time when the Clans were waging war against the Demon Clan and sealed them. Taken even further when the Ten Commandments state that their average lifespan is 1000 years old, so if they had passed those 3000 years outside of the seal, they would have died three times over.]]
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* The Nyan-Nyan (or Lai-Lai in the manga) from ''Manga/FushigiYuugi''. As goddesses, they don't age, and are as old as The Universe of the Four Gods itself, but they normally take the appearance of ''adorable'' little girls. At the end of the series proper, they ''do'' make an appearance as beautiful adult women (likely to symbolize that [[ComingOfAge Miaka has become more mature]]). And in the second OVA, one of them takes the form of a young teenage girl.
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* Considering that half the characters in MythicalDetectiveLokiRagnarok are gods or monsters from Myth/NorseMythology, this is to be expected. Though, most of them [[ImmortalImmaturity certainly don't act like it]]. Then again, they don't in the original myths either...
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* Considering that half the characters in MythicalDetectiveLokiRagnarok ''Manga/MythicalDetectiveLokiRagnarok'' are gods or monsters from Myth/NorseMythology, this is to be expected. Though, most of them [[ImmortalImmaturity certainly don't act like it]]. Then again, they don't in the original myths either...
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* ''GateKeepers''' Houjou Yukino looks like a ten year old even though she's more than eight hundred years old.
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* ''GateKeepers''' ''Manga/GateKeepers''' Houjou Yukino looks like a ten year old even though she's more than eight hundred years old.
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* The eponymous character from ''ImmortalRain'' looks to be in his twenties, but has been alive for the past 200 years. Same goes for the villain, the literal Methuselah, who has been endlessly reincarnated since the beginning of humanity.
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* The eponymous character from ''ImmortalRain'' ''Manga/ImmortalRain'' looks to be in his twenties, but has been alive for the past 200 years. Same goes for the villain, the literal Methuselah, who has been endlessly reincarnated since the beginning of humanity.
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* The trope name is exactly true for Caerula Sanguis from ''[[{{Gunnm}} Battle Angel Alita: Last Order]]''. Her age is actually quite significant. She has spent most of them learning and refining both her [[LadyofWar wu shu straightsword techniques]] and her [[BatmanGambit comprehensive combat strategies]] in the service of protecting humankind.
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* The trope name is exactly true for Caerula Sanguis from ''[[{{Gunnm}} ''[[Manga/{{Gunnm}} Battle Angel Alita: Last Order]]''. Her age is actually quite significant. She has spent most of them learning and refining both her [[LadyofWar wu shu straightsword techniques]] and her [[BatmanGambit comprehensive combat strategies]] in the service of protecting humankind.
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* D, the {{Dhampyr}} title character from the ''LightNovel/VampireHunterD'' franchise is one of anime's more extreme and tragic examples. He's the son of {{Dracula}}, and while the exact timeframe of his world is unclear, a time somewhere around A.D. 12,000 is hinted, meaning D has lived for ''over 10,000 years''. ''Vampire Hunter D: Bloodlust'' emphasizes the tragic aspect of this trope twice by noting an old man who recognizes D from when he was just a boy and then in a DistantFinale where D still looks the same in spite of the passage of several more decades.
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* ''Manga/FairyTail'': Zeref has the appearance of a teenager but is actually over four hundred years old due to being TheAgeless. [[spoiler:Mavis, having the same curse as him, had the appearance of a thirteen year old up until her "death" at age twenty-six]].
** [[spoiler:All five dragon slayers who were raised by dragons [[note]]Natsu, Gajeel, Wendy, Sting, and Rogue[[/note]] are all around the same age as Zeref. They were orphans (technically for Natsu, who still had Zeref) who were adopted by dragons. After being raised by them for a while, the dragons sealed themselves inside their respective children and brought them forward in time via the Eclipse Gate. The day all the dragons "disappeared" was actually the day the children arrived to the current era. That's why Fried's barrier in the Laxus arc was able to affect Natsu and Gajeel -- they technically are over the age of eighty, since they were born centuries ago]].
** [[spoiler:All five dragon slayers who were raised by dragons [[note]]Natsu, Gajeel, Wendy, Sting, and Rogue[[/note]] are all around the same age as Zeref. They were orphans (technically for Natsu, who still had Zeref) who were adopted by dragons. After being raised by them for a while, the dragons sealed themselves inside their respective children and brought them forward in time via the Eclipse Gate. The day all the dragons "disappeared" was actually the day the children arrived to the current era. That's why Fried's barrier in the Laxus arc was able to affect Natsu and Gajeel -- they technically are over the age of eighty, since they were born centuries ago]].
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** In the original Chibitalia strips, the declining Roman Empire/"Grandpa Rome" is a scarred old man; in the anime, he still appears as he did in his prime, leading the dub's LemonyNarrator to lampshade this by calling him Italy's "unusually handsome grandfather."
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Additional example. Monogatari was originally a series of light novels but was adapted to anime so it counts
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* Shinobu from Monogatari looks to be about 8 but used to actually look a lot older. Even so, she still looked a lot younger than the 500 years old she actually is.
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* Deconstructed in ''MermaidSaga''. Because the immortal Masato is stuck with the body of a young boy, he can't get by in society without a caretaker, which he often quickly outlives. He can't stay in one place for more than two years for risk of raising suspicion to his nature. He eventually goes nuts over having to deal with this for over eight hundred years.
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* Deconstructed in ''MermaidSaga''.''Manga/MermaidSaga''. Because the immortal Masato is stuck with the body of a young boy, he can't get by in society without a caretaker, which he often quickly outlives. He can't stay in one place for more than two years for risk of raising suspicion to his nature. He eventually goes nuts over having to deal with this for over eight hundred years.
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* The BigBad Liselotte Werckmeister from ''ElevenEyes'' has been around for 800 years due to her immortality.
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* The BigBad Liselotte Werckmeister from ''ElevenEyes'' ''VisualNovel/ElevenEyes'' has been around for 800 years due to her immortality.
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* The Wolkenritter of ''LyricalNanoha'' have existed for centuries at least but look like they're in their twenties. [[LittleMissBadass Vita]] is an extreme case.
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* The Wolkenritter of ''LyricalNanoha'' ''Franchise/LyricalNanoha'' have existed for centuries at least but look like they're in their twenties. [[LittleMissBadass Vita]] is an extreme case.
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* Beelzebub, the most feared demon (behind [[Manga/DragonBall Dabura]]) in the ''SandLand'' is somewhere around 2,000 years old but is still considered a child and has a bed time.
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* Beelzebub, the most feared demon (behind [[Manga/DragonBall Dabura]]) in the ''SandLand'' ''Manga/SandLand'' is somewhere around 2,000 years old but is still considered a child and has a bed time.
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** To an even more extreme example, there's Beerus and Whis. Beerus is old enough to be [[spoiler:the one who sealed Old Supreme Kai in the Z-Sword]], and was the one who wiped out the dinosaurs-this and [[VideoGame/DragonballXenoverse other media]] suggests he's been around for 75 million years minimum. Whis, however, [[spoiler:trains successive gods of destruction]], which would put him in the ballpark of perhaps hundreds of millions of years, [[TimeAbyss if not far longer.]] Both look like adult cat people/blue humanoids.
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* This trope takes its name from the tongue-in-cheek fan logic to explain the popularity of Sasami in ''Anime/TenchiMuyo'', who is otherwise joked to be the [[FanPreferredCouple best choice]] for the lead. Because she is [[HumanPopsicle technically]] "seven hundred years old", this supposedly made her fair game for fans. This of course ignores the fact the writers always give her the appearance and personality of a little girl and that most of that time was in hyper-sleep, but why worry about the ''details''...
** Pretty much Tenchi's whole family aside from him. His sister who looks to be in her mid to late 20's is 80. His father is 200 and looks like he is in his early 40's. His Grandmother ([[BerserkButton whom no one should ever call her by that name]]) looks maybe mid 30ish and is well over 700 years old (As does his Grandfather, but he keeps a disguise up to make him look 60-ish). And his great grandmother looks to be in her mid 30's too. The parents of Azusa, emperor of Jurai, Tenchi's great-great-grandparents, show up in GXP and look to be in their 40's. Tenchi's other great-great-grandparent, Seto, shows up in the OVA and GXP and looks to be about mid 30's despite being 5,000 years old.
** Supergenius MadScientist Washuu (who's actually either several thousand or several ''billion'' years old, depending on perspective) can change her appearance at will, and most often looks like a very precocious red-haired twelve-year-old girl.
*** Going back to Sasami; who fused with a being sister to Washu! (Ie; ''beginning of time''-years old), and Tokimi. Heck, Tenchi himself, considering he created the beings that created the universe (Sasami, Washu and Tokimi) which makes him pre-''beginning of time''-years old. Though that was [[{{Reincarnation}} in a different lifetime]], which he has no memory of.
** In the spinoff ''Anime/TenchiMuyoGXP'', Neju turns out to be more than two thousand years old. She plays to the lolicon fetish, teasing Seina (and indirectly all the other girls), such as calling Seina onii-chan. In her case, she's doing it deliberately, partly because she's feeling her years. She's also being naughty because she's had to be a [[ProperLady proper court lady]] for a couple of millennia, and now she's out of the harness and feeling frisky.
** ''Anime/TenchiMuyoWarOnGeminar'', another spinoff, is also rife with it. Aside from the references to [[TheHero Kenshi's]] [[SufficientlyAdvancedAliens relatives]], Wahanli, a cute teenage (apparently) WrenchWench is actually 97, for example.
* Flora from ''Manga/{{Berserk}}'' in a human witch whose name was mentioned in the Berserk timeline Circa 1000 BBG. In short, she has been around since 1000 years before the main character Guts was born. Her first appearance in the manga showed that she was indeed dying of old age, which meant that she was not immortal.
* ''Manga/YuYuHakusho'':
** Koenma is ''exactly'' seven hundred years old, and appears to be a toddler. He can transform into a bishonen teen form for a few minutes at a time... ''but doesn't remove his pacifier when he does so''.
** Koenma stays in teenage form continuously later in the series when it gets more serious. Eventually the pacifier is [[ChekhovsGun revealed to be a device to store energy]]. He keeps the pacifier in his mouth even after using up its stored energy, presumably because that's how he recharges it.
** This is [[PlayingWithATrope played with]] for Kurama: His human body really is a teenager like it appears to be, but his demon soul is thousands of years old.
** [[SuperPoweredEvilSide Yoko Kurama]] looks like a 20-to-early-30s man, [[spoiler: yet he was [[AuthorityEqualsAsskicking Yomi]]'s superior and possibly elder authority a thousand years ago.]]
* Lady Kayura from ''Anime/RoninWarriors'' is roughly a millennium old, appears to be in her mid-teens, but is physically 12 years old.
* In ''Manga/MagicKnightRayearth'', the Guru Clef is appalled by the fact that the Knights are "mere children." When Umi accuses him of the same, he informs her haughtily that he is actually 745 years old, though he looks about 10. Princess Emeraude is the same way. It's lampshaded in Part II, when someone from the invading countries points out to their [[TeenGenius teenage chief engineer]] that just because Hikaru looks fourteen doesn't mean she's actually his age.[[note]]Although she is actually that age, they don't know she's not native to Cephiro.[[/note]]
* Evangeline from ''Manga/MahouSenseiNegima'' was turned into a vampire when she was about ten and consequently has not aged at all in the hundreds of years since. She actually expresses a desire to become and be seen as a beautiful, mature woman rather than a child, and projects an illusion of such a form whenever she can. The illusion apparently has physical substance, but hey. [[AWizardDidIt It's magic]].
** It also seems that [[spoiler:Zect, the boy from the flashbacks]] was ''Nagi's master'', and was several centuries old himself.
** Fate Averruncus also claims to be several hundred years old, although in his case it's unclear whether he's referring specifically to [[spoiler:his current incarnation or his past lives as well.]]
** The StealthSequel series ''Manga/UQHolder'' introduces the titular organization, a group composed of immortals, most of whom fit this description. Eva, under the alias "Yukihime" is a member.
* ''Franchise/SailorMoon'':
** Like Sasami, the manga version of Chibi-Usa from ''Manga/SailorMoon'' is 901 years old during her introduction, with the body and face of a 10 year-old, although this is largely [[AdaptationDistillation thrown out]] in other media.
** For that matter, Sailor Pluto's association with relative TimeTravel makes it very difficult to pin her age down, although her [[NotDrawnToScale given age]] says she's in her twenties, which is what she appears to be.
** Any of the fey-like characters are possibly quite old, like Helios, Perle of ''[=SuperS=]'': TheMovie, etc. None of them look to be over their early twenties, and most of them look like teenagers.
** The entire main cast also qualifies, or rather their future selves in Crystal Tokyo, all of whom are over 1000 years old. (While the Outer Senshi don't appear here other then Pluto in the anime and Manga, The ''Theatre/SeraMyu'' inculdes them, and has their future versions fight alongside the inners from the past during the Black Lady musicals)
* ''Anime/KiddyGrade'' has Eclair and Lumiere, who physically look 16 and 10 respectively [[spoiler:And it turns out they're both approximately 200-250 years old.]]
** This one is arguable, as the girls are [[spoiler:quantum reincarnated into new bodies periodically, so their current bodies, despite looking 16 and 10, are actually younger than that. In addition, Lumiere should have a 16 year old body, too, but she seals her Particle power, which also traps her body in a convenient young-looking form.]]
* In ''LightNovel/TrinityBlood'', [[spoiler:Seth, the Empress of the Methuselah]], is at least 900 years old, despite looking like a "cute young girl", by her own description.
** Being [[spoiler:her older brothers]], [[spoiler:Abel and Cain]] are a bit older than her. They only look in their twenties, though.
** And to lesser extent, the [[OurVampiresAreDifferent Methuselah]] from the same series, whose life expectancy averages around three centuries or so, but their appearance stops aging once their powers awaken. Suleyman, for example, looked to be in his late twenties but was Really Three Hundred Years Old.
** ''Ion''. He looks like a young boy and is probably older than half the other characters.
* Libra Dhoko from ''Manga/SaintSeiya'' is 247 years old. While he looks like an old man, that is just a form to hide his young body.
* The dolls in ''Manga/RozenMaiden'' are supposedly more than a century old. Being dolls, they nevertheless look and act much like children.
* In ''Manga/KnightsOfSidonia'', the appropriately-named Immortal Council is made up of members of the ship's crew who maintain their longevity with biotechnology. Kobayashi, the captain of Sidonia, is one such member, being hundreds of years old but not looking a day over 30. She wears a mask in public to hide the fact that she's been captain for centuries.
* Though not expected to be a romantic interest, Hellmaster Phibrizzo of ''LightNovel/{{Slayers}}'' sort of falls under this trope, as the demon lord was created at least a thousand years ago, yet continues to appear as a ten year old boy. Admittedly, though, demons such as himself can take any shape they please, but we never see him look like anything else even in flashbacks.
** He briefly takes on his true form in the last episode of ''Slayers Next'' [[spoiler: shortly before he is destroyed by the Lord of Nightmares]]. Also, Fibrizo was created before Shabranigdu was split, so it's at least five thousand years ago.
* Enma Ai from ''Anime/HellGirl'' looks like a little girl, albeit a creepy one. However she has been dispatching people to hell for many a century.
* C.C. from ''Anime/CodeGeass'' looks to be 16 or so, but is apparently old enough that she was on a FirstNameBasis with George Washington and Ben Franklin... and that's just the tip of the iceberg. To be precise she was born in medieval times.
* [[spoiler:Yukito]] of ''Manga/CardcaptorSakura''. He's Yue's [[spoiler:alternate form]], and Yue was created by the several-centuries-old magician Clow Reed in his original life.
** Kero is approximately (if not the exactly) the same age.
* Yuko Ichihara from ''Manga/XxxHOLiC'' and ''Manga/TsubasaReservoirChronicle'', both of which have close ties with the [[Manga/CardcaptorSakura aforementioned series]], never mentioned her exact age, but she was on a first name basis with Clow Reed, several hundred years ago. [[spoiler:Clow accidentally [[RealityWarper warped reality]] so that the universe would ignore her death. Once this is undone, 99% of people's memories are edited so that it is as if she died when she died as far as everyone but close friends and relations are concerned.]]
** [[spoiler:Fai D. Flourite]], who, because of having extreme magical power, is many times Kurogane's age (we're not told the exact age). Other powerful Valerians are presumably like this to varying degrees, as well.
** Lastly, this seems to be a thing in [[spoiler:Celes]] (judging by how people age in [[spoiler:Fai's backstory]]), possibly for the same reason.
* ''Manga/{{Bleach}}'':
** Shinigami have a potential lifespan that spans thousands of years. It takes many decades just for them to reach adulthood resulting in characters who are biologically 13 years old being chronologically as old as human grandparents. One of the oldest shinigami, Yamamoto, had been around for well over 2,000 years.
** Yhwach has been around for over a thousand years. Although he is called a Quincy, it's unknown whether he's a human with an impossible lifespan or a dead Quincy whose spirit therefore follows the same aging rules as for shinigami (who are also spirits) is unknown. [[spoiler:He claims the Soul King is his father, which confuses his origin story even more.]]
** In the anime filler, the Bounts were born many centuries before the current storyline during a lab accident in Soul Society. The shinigami responsible for this [[spoiler: Ran Tao]] has an even more extended lifespan than normal shinigami due to the aid of science.
* Holo from ''LightNovel/SpiceAndWolf'' is a centuries-old wolf god who assumes the form of a teenage girl.
* In ''Anime/RevolutionaryGirlUtena'', while we do not know just how old [[spoiler:Akio and Anthy]] are, it is clear that they have been around for a long time, possibly as long as the very concepts of 'Prince', 'Princess', and 'Witch'. Same goes for [[spoiler:Mikage]], though he may have been DeadAllAlong.
* Son Goku in ''Manga/{{Saiyuki}}'' was been imprisoned in a rock for 500 years without aging before being freed by Sanzo. Goku's apparent age is supposed to be 18, but he looks 12.
* Deconstructed in ''MermaidSaga''. Because the immortal Masato is stuck with the body of a young boy, he can't get by in society without a caretaker, which he often quickly outlives. He can't stay in one place for more than two years for risk of raising suspicion to his nature. He eventually goes nuts over having to deal with this for over eight hundred years.
* Chizuru in ''LightNovel/{{Kanokon}}'' is 400 years old, yet looks (and acts) like an 18 year old. After all this time, she's ''still'' a virgin.
** Don't forget about Nozomu, who is stated to be 200 years old, despite looking like an elementary student.
* The Mu in ''Manga/TowardTheTerra'' can keep a youthful appearance despite living much longer than normal humans. Namely Blue who is 300 years old.
* In ''LightNovel/KyoKaraMaoh'' the Mazoku live many a century and age at a much slower rate than humans do. A radical example would be Ulrike who is 800 years old yet looks like a little girl. Somewhat subverted in Ondine's sister who does look quite old despite the fact that her sister, who is even older than Ulrike, still seems very much like a kid. An interesting case is [[spoiler:Murata who looks like a teen yet has memories from several reincarnations going back millennia]].
** In the anime, at least, we are told that ordinary Mazoku age about 1 human year for every 5 years they live (hence Wolfram is in his 80s but seems to be about 16 or 17). Ulrike and Ondine's positions as ''Genshi Miko'' (basically high priestesses) seem to have allowed them to age even slower, hence Ondine appearing so much younger than her own twin sister.
* Miyu in ''Manga/VampirePrincessMiyu'' is tragic example of this trope. She looks thirteen years old, [[spoiler:but her growth was magically stunted by the Shinma so she can hunt the ones who ran away to the human world and take all the time in the world to do so]].
* Czeslaw Meyer of ''LightNovel/{{Baccano}}'' looks like he's ten years old. In hindsight, he probably should have waited a little longer before drinking the elixir of immortality in 1711...
** Of course, he's far from the only one, even if he's the most extreme case. There are quite a few characters (Huey, Elmer, Maiza, etc.) that drank the same concoction, making most of them at least 250 years old by the time the series starts. There's also Firo, who already had enough trouble [[OlderThanTheyLook passing for his actual age]] ''before'' immortality...
** However, unlike the others, the only thing Czeslaw really gained from his immortality was the ability to survive [[BreakTheCutie ''years'' of torture]]. Added on to 200+ years of eternal childhood and, well... [[BlessedWithSuck sucks to be him]]. In comparison [[spoiler: Sylvie]], who while still immortal, deliberately waited until she was in her twenties to become so to avoid spending eternity as a teenager. Look at Czeslaw's experience and say that this wasn't a good move.
* Master Karin of ''Manga/DragonBall'' looks like an ordinary house cat (albeit a [[FunnyAnimal walking, talking]] house cat) but is really over 800 years old.
** Master Roshi (aka Muten Roshi), despite looking in his 70s since the start is actually ''300 years old'', as is his rival the Crane Hermit and ''his'' brother Mercenary Tao. Roshi and Crane are old enough to have been young monks when King Piccolo ravaged the Earth 300 years ago. Garlic and his son Garlic Jr., nemeses to Kami in a NonSerialMovie and anime filler are also at least 300 years old. And if you think that's astounding, Roshi's older sister Uranai Baba, is ''500 years old''. In anime {{filler}}, Roshi's turtle celebrates his one thousandth birthday. Mr. Popo has been attendant to every Guardian of Earth (or at least a large number), so he's much, much older.
** The Nameless Namekian separated into Kami and King Piccolo 300 years ago, having already been about 200 when this happened. Non Serial Movie villain Lord Slug and Namekian elder Guru (who actually ''does'' look his age) is also from this time. Oddly enough, prior to remerging with Kami, Piccolo Jr., King Piccolo's reincarnation was about 14 years old (though he had already merged with an older Namekian in the Frieza saga). Namekian merging is... complicated.
** The Kais are in the millions of years old. The Eastern Supreme Kai killed Bibidi, the creator of Majin Buu, five million years ago, making Bibidi's son Babidi at least that old. Numerous other demons and deities from both the original manga and anime filler are likely at least as old.
*** Old Supreme Kai takes the cake here, as he's ridiculously old even by Kai standards. He actually does look pretty old, but he counts his age as "15 generations". Logically, he'd be talking about ''Kai'' generations. Considering that Eastern Supreme Kai has not visibly aged in 5 million years, this would be an [[TimeAbyss unbelievably long time indeed.]]
*** Furthermore, the age he's showing is not his own. He accidentally fused with an old witch when he was young, and has looked that old ever since.
* ''Manga/{{Trigun}}'' has [[spoiler:Vash and Knives]], who look in their mid-twenties despite being over 130 years old in the anime and over 150 years old in the manga. It's also unspecified just how old [[spoiler:(manga only) Chronika/Kronika and Domina]] are, but they might be over a century (they also look in their mid- to late twenties, while [[spoiler:the twins]] still looked like teenagers when they were 'only' eighty years old).
* ''Manga/FullmetalAlchemist'' has the Really Four Hundred Years Old [[spoiler:Hohenheim]], who perpetually looks in his thirties or forties. The manga also has [[spoiler:Father]], who looks about twenty years older than the former, and the anime has [[spoiler:Dante, Hohenheim's repudiated wife]]. Most of the homunculi count too, especially [[spoiler:Envy in the anime (400+ ), Pride/Selim in the manga (400+ but the body of a little boy), and Greed (200+ ) in most of his incarnations]].
** Ironically, in the manga, the oldest Homunculus, [[spoiler: Pride, has the appearance of a 6-year-old]], whilst the youngest Homunculus [[spoiler: (discounting Ling as the second Greed), is Wrath, the oldest-looking of the Homunculi - who happens to be the only one that actually looks his age.]]
* The eponymous character from ''ImmortalRain'' looks to be in his twenties, but has been alive for the past 200 years. Same goes for the villain, the literal Methuselah, who has been endlessly reincarnated since the beginning of humanity.
* ''Anime/TengenToppaGurrenLagann'' has Lordgenome, who looks to be no older than his early forties, but is actually at least 1000 years old.
** This is the case for all the Beastmen, considering that Cytomander can be referred to as a fledgeling despite being over 200 years old and Guame is only a few years younger than Lordgenome. (Although Guame at least looks elderly, at least as far as one can tell with an anthropomorphic armadillo)
* ''Manga/{{Claymore}}'' has Isley and Riful, who look like a [[{{Bishonen}} handsome young man]] and a [[CreepyChild little girl]] respectively despite being centuries old, not to mention [[WasOnceAMan not even human.]]
* The trope name is exactly true for Caerula Sanguis from ''[[{{Gunnm}} Battle Angel Alita: Last Order]]''. Her age is actually quite significant. She has spent most of them learning and refining both her [[LadyofWar wu shu straightsword techniques]] and her [[BatmanGambit comprehensive combat strategies]] in the service of protecting humankind.
* Subverted in episode two of otherwise softcore (by modern standards) ''TheElvenBride''. When the eponymous elf was asked about her age, she replies seventeen, to which the girl pointed out that seventeen elf years is long in comparison to human years. She promptly explains that she has only lived 17 human years since she was born.
* Many of the protagonists from Tsutomu Nihei's ''Blameverse'' stories, due to being advanced cyborgs. Sosono Musubi of ''Noise'' goes on to live for millennia after being upgraded by The Safeguard. Killy from ''Manga/{{Blame}}'' is at least 3,000, but he doesn't realize it because his brain has run out of space several times and had to be overwritten.
* Taikoubou from ''Manga/SoulHunter'', despite looking like a teenager, is revealed right in the beginning to be an immortal who is 72+ years old. However, it is later revealed that he is [[spoiler: much older than even that when he returns to being Fukki, one of the First People (an ancient alien race)]].
* ''Webcomic/AxisPowersHetalia'' [[MagicRealism isn't very clear about how age applies to its characters]], but China's profile says that he's 4,000 years old and he doesn't look much older than his mid-twenties.
** "I've loved you since the 900s." -Holy Roman Empire to Chibitalia.
*** Since the nations have been shown in different historical events at different times, it's safe to assume that they're more than a century or two old.
** [[WordOfGod The author]] has explicitly stated that China is immortal.
** There are also WordOfGod "human ages" for several of the characters, placing most of the characters biologically in their twenties – for instance, America is 19, Italy and Germany are both 20, and England is 23 – but China alone is listed as 4,000 years old and immortal. Countries seem to age according to both how old they are and how quickly the country develops; Italy was a small child for (presumably) centuries, but England received quite a shock when he left a tiny America and came back after a few decades to find one that was taller than him.
* Beelzebub, the most feared demon (behind [[Manga/DragonBall Dabura]]) in the ''SandLand'' is somewhere around 2,000 years old but is still considered a child and has a bed time.
* Mito of ''Anime/SpacePirateMito'' is an alien that is over ten thousand years old, but looks like she could be in third grade.
* ''Manga/{{Hellsing}}'':
** Alucard. He's a 567-year-old vampire at the start of the series, and he looks to be in his early forties at ''most''. This depiction of his age has historical basis. The real Vlad Dracula died in battle in 1476 at the age of forty-five. In ''Hellsing'', his backstory is that instead of dying in battle, he was captured and to be executed, but chose to defy his fate and become a vampire instead.
** In the prequel manga series ''Hellsing: The Dawn'', Alucard takes the form of a 14-year-old girl.
** Don't forget Helena from the anime. She appears to be a prepubescent girl somewhere between twelve and fourteen years old, apparently because she was turned into a vampire at a very young age, and has been around for a very, ''very'' long time. Just how long is never determined, but it's implied that she is one of the oldest vampires ever seen in the series.
** Seras in the manga/[=OVA=] is beginning down the road to this trope. She was about 20 when she became a vampire. In the epilogue, 30 years later, she still looks the same (in contrast to Integra, who's visibly older).
* In ''Manga/{{Nobunagun}}'', the DOGOO Commander is almost 1,800 years old, while her assistant Saint-Germain is around 1,000 years old. In the Commander's case this is due to several centuries-long periods of stasis that she underwent while combing through history looking for individuals to turn into E-genes, while Saint-Germain is implied to have CompleteImmortality.
* In ''Anime/NeonGenesisEvangelion'', Ayanami Rei has a 14-year-old body, but the soul of an entity that is ''billions'' of years old. So does Kaworu.
** Keel Lorentz, the head of [[AncientConspiracy SEELE foundation]], is rumored to be an Eternal Jew himself. Though he leaves enough of the [[HollywoodCyborg high-tech implants ]]during the Instrumentality.
* ''Manga/InuYasha'': {{Youkai}} have lifespans that are vastly in excess of human lifespans. Even child characters such as [[{{Kitsune}} Shippou]] have been around for decades despite their biological youth. Teen characters such as Sesshoumaru have been around for centuries. Even a HalfHumanHybrid has an unnaturally long lifespan. The {{canon}} never gives Inuyasha's age, but a flashback to his mother shows she wore the clothes of a Heian noblewoman, and that era died out 500 years before the story's setting ([[{{Filler}} the anime gives him an age of 200]]). [[BigBad Naraku]] [[HalfHumanHybrid himself]] has been around for decades at least.
* Washuu Ryuugasaki, the school principal in ''Anime/CyberTeamInAkihabara''.
** Don't forget Crane Bahnsteik and Cigogne Ratspieu.
* Cassian from ''{{Godchild}}'' is really thirty-five, but a medical condition caused his body to stop growing just before he hit puberty.
* [[http://www.onemanga.com/Katekyo_Hitman_Reborn/254/03/ The entire Arcobaleno]] of ''Manga/KatekyoHitmanReborn'' apparently.
** Another character is far older than he appears: [[spoiler:Kawahira belongs to a race of pre-human Earthlings and is responsible for every generation of Arcobaleno]].
* All the vampires and dampirers from ''Manga/TheRecordOfAFallenVampire'', with the exception of [[OlderThanTheyLook Laetitia]], who's only in her 60s.
* Cheza in ''Anime/WolfsRain'' looks to be about 13 or so, but is actually around 200 years old. Lord Darcia and his lover Hamona are also several centuries old, but appear to be in their 20s.
* In ''Manhwa/ChroniclesOfTheCursedSword'', [[MorallyAmbiguousDoctorate Dr.]] [[MadDoctor Laobi]] looks like she's in her mid-twenties, but is late found to be about 150 and [[spoiler: the mother of the BadassGrandpa and OldMaster.]] She keeps herself looking young with [[ForScience Science]].
* Melchisedec, Carmichael and the Emilys in ''Anime/StrainStrategicArmoredInfantry''.
* Elda Marker from ''Manga/{{Karin}}''. In fact, she looks younger than Karin herself, despite being unspeakably old.
* In ''Anime/YuGiOh'' Dartz looks twenty despite being 10,000 years old.
** Yami and Bakura might fall under this trope as well, but technically, they're spirits inhabiting the bodies of two 16-year-olds.
* Klan Klang from ''Anime/MacrossFrontier'' is an odd example. In her natural [[AttackOfThe50FootWhatever Zentraedi]] state, she looks the right age (BoobsOfSteel aside), but when [[IncredibleShrinkingMan micronized]] to human size she looks like a 10- or 12-year-old because of a genetic defect. This actually inhibits a potential relationship with her crush [[ChivalrousPervert Mikael]], who points out that if they got together, [[{{Lolicon}} he'd be arrested]] - which earns him a DopeSlap from the unhappy Klan.
* Dragons, like Filia and Valgaav, and ''Mazoku'', like Xellos, are either long-lived or immortal in ''LightNovel/{{Slayers}}''; Xellos is well over a millennium old, Valgaav is shown to be at least as old as Xellos, while Filia is several hundred years old, but not as old as Valgaav (which is pointed out in the anime, when she is shown tidbits of Valgaav's childhood). While elves also live at least twice as long as humans do, some human sorcerers with a lot of magical power can live for a century or two. Finally, chimeras can live for ages or die quickly, something that was [[WordOfGod addressed by the light novel author]]. In theory, if [[JerkWithAHeartOfGold Zelgadis]] were to remain a chimera for the rest of his life, he could live for several hundred years.
* The BigBad Liselotte Werckmeister from ''ElevenEyes'' has been around for 800 years due to her immortality.
* Mephisto Pheles of ''Manga/BlueExorcist'' [[spoiler:is said to have been working with the exorcists for around 200 years at this point. He is probably even older than that.]] He looks more like he's in his thirties - sometimes a little younger or older.
* One chapter of SayonaraZetsubouSensei shows a [[FlashForward brief glimpse fifty years into the future]] in which the former students have noticeably aged (Nami and Mataro are white-haired and wrinkled, Usui is almost completely bald, Kaede is shown in silhouette but has a granddaughter). Then there's [[spoiler: [[NightmareFuelStationAttendant Kafuka]],]] who hasn't changed. ''At all''.
* Akasha Bloodriver from ''RosarioToVampire'' looked to be in her late twenties at the oldest... and looked exactly the same 200 years ago. Same goes for the other Dark Lords, though Fuhai plays with this a bit by having a SleepModeSize body that looks like a MiniatureSeniorCitizen.
** The [[AnIcePerson Snow Priestess]] is well over 100, but looks 30-40.
* The Wolkenritter of ''LyricalNanoha'' have existed for centuries at least but look like they're in their twenties. [[LittleMissBadass Vita]] is an extreme case.
* Tomoe from ''Manga/KamisamaKiss'' looks to be in his late teens, early twenties but has been around for over five centuries.
* [[HotWitch Arachne]] from ''Manga/SoulEater'' is over 800 years old. You sure as hell wouldn't be able to tell by looking at her.
** The same goes for Asura, on the occasions he comes across as more 'human' than [[HumanoidAbomination 'abomination']].
* Demons in ''Manga/TheWorldGodOnlyKnows'' are several hundred years old, but look and act like teenagers; except for Elsea, who [[ImmortalImmaturity acts like an eight-year-old]].
* In ''LightNovel/DragonCrisis'' Maruga, the White Dragon Empress looks to be in her late teens/early twenties, but she knew her uncle, who died over a hundred years ago, which means she is over a hundred years old. Onyx, who was Maruga's childhood friend would also be over a hundred as well.
* In ''Manga/{{Toriko}}'', the three disciples of Acacia (Ichiryu, Jiro, and Midora) are at least over 200 years old. They certainly don't look it, and they're some of the most powerful people in the series.
* Considering that half the characters in MythicalDetectiveLokiRagnarok are gods or monsters from Myth/NorseMythology, this is to be expected. Though, most of them [[ImmortalImmaturity certainly don't act like it]]. Then again, they don't in the original myths either...
* PlayedForLaughs in ''LightNovel/LoveChunibyoAndOtherDelusions'', where Shinka, when she was in her MsImagination persona "Mori Summer," claimed of 700 years old more than she actually is and was the only living mage in the world.
* ''Manga/HekikaiNoAion'': Seine is 300 years old and has an appearance of a teenager.
* ''GateKeepers''' Houjou Yukino looks like a ten year old even though she's more than eight hundred years old.
* Shrine Maiden Ulrike, from ''LightNovel/KyoKaraMaoh'', is 800 but looks like a young girl. Ondine, the maiden before Ulrike looks ''even younger''.
* King and his sister, Elaine, from ''Manga/TheSevenDeadlySins'' have the appearance of little kids, but they are both much, ''much'' older than what they look like. They're at least over seven hundred years old, for those curious.
* THE ENTIRE MAIN CAST of LightNovel/HaruhiSuzumiya, due to a time loop that made them live for over 600 years. Only one team member actually REMEMBERS all those hundreds of years, making her the only one likely to TRULY be 600+. Haruhi/Kyon might be if they are the godlike being/s the whole series is revolving around. In fact, with them, it might be a TimeAbyss that neither can remember.
** [[spoiler:Mikuru never told us her real age, not to mention her possibly far past adult self doing the same.]]
* ''LightNovel/{{Campione}}'' has Divine Ancestors, goddesses who were trapped in the form of pre-pubescent children when a god usurped their position. Many spend centuries seeking to regain their power, never aging unless they sacrifice their eternal youth to [[ScaledUp become a dragon]].
** The two female Campiones also qualify, appearing to be in their teens but having actually lived centuries.
** Pandora, the goddess who watches over the Campione ritual and asks them to treat her as their mother, looks like a young child. The ritual has been in place for centuries.
* From ''Manga/{{Naruto}}'' we have the Toad Sages: Fukasaku, Shima, and the Great Toad Sage. Fukasaku and Shima are ''800 years old'' while the Great Toad Sage is ''1000 years old'', making them the oldest lived beings next to the ''Biju'' which are ''thousands of years old''.
* [[OurVampiresAreDifferent The Pillar Men]] of ''Manga/JoJosBizarreAdventure''. They all pre-date human civilization(their oldest being [[TimeAbyss over 100,000 years old]]), but look like at most 30s-year old [[HornedHumanoid men with horns.]] To a lesser extent there's [[BigBad Dio]] [[TimeSkip in Part 3]], who's 120 while still looking in his mid-20s.
* While ''Manga/CatGod'' is full of gods and spirits that are older than they look, Shamo is a standout case as she's noted to be an influential god and notes when meeting Yuzu that she's the first person to treat her like a child to the extent she did (giving her a bath, sewing up her stuffed animal, etc).
* In ''Animation/GuardianFairyMichel'', Michel looks like a young boy but is as old as the Earth itself.
* ''Manga/ArataKangatari'' has Princess Kikuri, who looks 8 years old but is really around 60 years old. There are also the 12 Shinsho, who, when given their Hayagami, stop aging. For example, Kikutsune is over a thousand years old and looks 17. And then there's Kugura, who found his Hayagami Shinado when he was 13, and since then has remained in the form of a 13-year old, despite being older than 300.
* The devil Koumoto Akane from ''Manga/MyMonsterSecret'' claims that she is over 1000 years old, yet looks like a grade-schooler, despite being the principal of the school. Her mostly-human great-great-granddaughter Akari doesn't share this trait, however, making her look far older than her own ancestor, enough to be the butt of ChristmasCake jokes. The angel Shirogane Karen's age is more vague, but she is already around even since Akari was born, likely making her this trope as well.
----
** Pretty much Tenchi's whole family aside from him. His sister who looks to be in her mid to late 20's is 80. His father is 200 and looks like he is in his early 40's. His Grandmother ([[BerserkButton whom no one should ever call her by that name]]) looks maybe mid 30ish and is well over 700 years old (As does his Grandfather, but he keeps a disguise up to make him look 60-ish). And his great grandmother looks to be in her mid 30's too. The parents of Azusa, emperor of Jurai, Tenchi's great-great-grandparents, show up in GXP and look to be in their 40's. Tenchi's other great-great-grandparent, Seto, shows up in the OVA and GXP and looks to be about mid 30's despite being 5,000 years old.
** Supergenius MadScientist Washuu (who's actually either several thousand or several ''billion'' years old, depending on perspective) can change her appearance at will, and most often looks like a very precocious red-haired twelve-year-old girl.
*** Going back to Sasami; who fused with a being sister to Washu! (Ie; ''beginning of time''-years old), and Tokimi. Heck, Tenchi himself, considering he created the beings that created the universe (Sasami, Washu and Tokimi) which makes him pre-''beginning of time''-years old. Though that was [[{{Reincarnation}} in a different lifetime]], which he has no memory of.
** In the spinoff ''Anime/TenchiMuyoGXP'', Neju turns out to be more than two thousand years old. She plays to the lolicon fetish, teasing Seina (and indirectly all the other girls), such as calling Seina onii-chan. In her case, she's doing it deliberately, partly because she's feeling her years. She's also being naughty because she's had to be a [[ProperLady proper court lady]] for a couple of millennia, and now she's out of the harness and feeling frisky.
** ''Anime/TenchiMuyoWarOnGeminar'', another spinoff, is also rife with it. Aside from the references to [[TheHero Kenshi's]] [[SufficientlyAdvancedAliens relatives]], Wahanli, a cute teenage (apparently) WrenchWench is actually 97, for example.
* Flora from ''Manga/{{Berserk}}'' in a human witch whose name was mentioned in the Berserk timeline Circa 1000 BBG. In short, she has been around since 1000 years before the main character Guts was born. Her first appearance in the manga showed that she was indeed dying of old age, which meant that she was not immortal.
* ''Manga/YuYuHakusho'':
** Koenma is ''exactly'' seven hundred years old, and appears to be a toddler. He can transform into a bishonen teen form for a few minutes at a time... ''but doesn't remove his pacifier when he does so''.
** Koenma stays in teenage form continuously later in the series when it gets more serious. Eventually the pacifier is [[ChekhovsGun revealed to be a device to store energy]]. He keeps the pacifier in his mouth even after using up its stored energy, presumably because that's how he recharges it.
** This is [[PlayingWithATrope played with]] for Kurama: His human body really is a teenager like it appears to be, but his demon soul is thousands of years old.
** [[SuperPoweredEvilSide Yoko Kurama]] looks like a 20-to-early-30s man, [[spoiler: yet he was [[AuthorityEqualsAsskicking Yomi]]'s superior and possibly elder authority a thousand years ago.]]
* Lady Kayura from ''Anime/RoninWarriors'' is roughly a millennium old, appears to be in her mid-teens, but is physically 12 years old.
* In ''Manga/MagicKnightRayearth'', the Guru Clef is appalled by the fact that the Knights are "mere children." When Umi accuses him of the same, he informs her haughtily that he is actually 745 years old, though he looks about 10. Princess Emeraude is the same way. It's lampshaded in Part II, when someone from the invading countries points out to their [[TeenGenius teenage chief engineer]] that just because Hikaru looks fourteen doesn't mean she's actually his age.[[note]]Although she is actually that age, they don't know she's not native to Cephiro.[[/note]]
* Evangeline from ''Manga/MahouSenseiNegima'' was turned into a vampire when she was about ten and consequently has not aged at all in the hundreds of years since. She actually expresses a desire to become and be seen as a beautiful, mature woman rather than a child, and projects an illusion of such a form whenever she can. The illusion apparently has physical substance, but hey. [[AWizardDidIt It's magic]].
** It also seems that [[spoiler:Zect, the boy from the flashbacks]] was ''Nagi's master'', and was several centuries old himself.
** Fate Averruncus also claims to be several hundred years old, although in his case it's unclear whether he's referring specifically to [[spoiler:his current incarnation or his past lives as well.]]
** The StealthSequel series ''Manga/UQHolder'' introduces the titular organization, a group composed of immortals, most of whom fit this description. Eva, under the alias "Yukihime" is a member.
* ''Franchise/SailorMoon'':
** Like Sasami, the manga version of Chibi-Usa from ''Manga/SailorMoon'' is 901 years old during her introduction, with the body and face of a 10 year-old, although this is largely [[AdaptationDistillation thrown out]] in other media.
** For that matter, Sailor Pluto's association with relative TimeTravel makes it very difficult to pin her age down, although her [[NotDrawnToScale given age]] says she's in her twenties, which is what she appears to be.
** Any of the fey-like characters are possibly quite old, like Helios, Perle of ''[=SuperS=]'': TheMovie, etc. None of them look to be over their early twenties, and most of them look like teenagers.
** The entire main cast also qualifies, or rather their future selves in Crystal Tokyo, all of whom are over 1000 years old. (While the Outer Senshi don't appear here other then Pluto in the anime and Manga, The ''Theatre/SeraMyu'' inculdes them, and has their future versions fight alongside the inners from the past during the Black Lady musicals)
* ''Anime/KiddyGrade'' has Eclair and Lumiere, who physically look 16 and 10 respectively [[spoiler:And it turns out they're both approximately 200-250 years old.]]
** This one is arguable, as the girls are [[spoiler:quantum reincarnated into new bodies periodically, so their current bodies, despite looking 16 and 10, are actually younger than that. In addition, Lumiere should have a 16 year old body, too, but she seals her Particle power, which also traps her body in a convenient young-looking form.]]
* In ''LightNovel/TrinityBlood'', [[spoiler:Seth, the Empress of the Methuselah]], is at least 900 years old, despite looking like a "cute young girl", by her own description.
** Being [[spoiler:her older brothers]], [[spoiler:Abel and Cain]] are a bit older than her. They only look in their twenties, though.
** And to lesser extent, the [[OurVampiresAreDifferent Methuselah]] from the same series, whose life expectancy averages around three centuries or so, but their appearance stops aging once their powers awaken. Suleyman, for example, looked to be in his late twenties but was Really Three Hundred Years Old.
** ''Ion''. He looks like a young boy and is probably older than half the other characters.
* Libra Dhoko from ''Manga/SaintSeiya'' is 247 years old. While he looks like an old man, that is just a form to hide his young body.
* The dolls in ''Manga/RozenMaiden'' are supposedly more than a century old. Being dolls, they nevertheless look and act much like children.
* In ''Manga/KnightsOfSidonia'', the appropriately-named Immortal Council is made up of members of the ship's crew who maintain their longevity with biotechnology. Kobayashi, the captain of Sidonia, is one such member, being hundreds of years old but not looking a day over 30. She wears a mask in public to hide the fact that she's been captain for centuries.
* Though not expected to be a romantic interest, Hellmaster Phibrizzo of ''LightNovel/{{Slayers}}'' sort of falls under this trope, as the demon lord was created at least a thousand years ago, yet continues to appear as a ten year old boy. Admittedly, though, demons such as himself can take any shape they please, but we never see him look like anything else even in flashbacks.
** He briefly takes on his true form in the last episode of ''Slayers Next'' [[spoiler: shortly before he is destroyed by the Lord of Nightmares]]. Also, Fibrizo was created before Shabranigdu was split, so it's at least five thousand years ago.
* Enma Ai from ''Anime/HellGirl'' looks like a little girl, albeit a creepy one. However she has been dispatching people to hell for many a century.
* C.C. from ''Anime/CodeGeass'' looks to be 16 or so, but is apparently old enough that she was on a FirstNameBasis with George Washington and Ben Franklin... and that's just the tip of the iceberg. To be precise she was born in medieval times.
* [[spoiler:Yukito]] of ''Manga/CardcaptorSakura''. He's Yue's [[spoiler:alternate form]], and Yue was created by the several-centuries-old magician Clow Reed in his original life.
** Kero is approximately (if not the exactly) the same age.
* Yuko Ichihara from ''Manga/XxxHOLiC'' and ''Manga/TsubasaReservoirChronicle'', both of which have close ties with the [[Manga/CardcaptorSakura aforementioned series]], never mentioned her exact age, but she was on a first name basis with Clow Reed, several hundred years ago. [[spoiler:Clow accidentally [[RealityWarper warped reality]] so that the universe would ignore her death. Once this is undone, 99% of people's memories are edited so that it is as if she died when she died as far as everyone but close friends and relations are concerned.]]
** [[spoiler:Fai D. Flourite]], who, because of having extreme magical power, is many times Kurogane's age (we're not told the exact age). Other powerful Valerians are presumably like this to varying degrees, as well.
** Lastly, this seems to be a thing in [[spoiler:Celes]] (judging by how people age in [[spoiler:Fai's backstory]]), possibly for the same reason.
* ''Manga/{{Bleach}}'':
** Shinigami have a potential lifespan that spans thousands of years. It takes many decades just for them to reach adulthood resulting in characters who are biologically 13 years old being chronologically as old as human grandparents. One of the oldest shinigami, Yamamoto, had been around for well over 2,000 years.
** Yhwach has been around for over a thousand years. Although he is called a Quincy, it's unknown whether he's a human with an impossible lifespan or a dead Quincy whose spirit therefore follows the same aging rules as for shinigami (who are also spirits) is unknown. [[spoiler:He claims the Soul King is his father, which confuses his origin story even more.]]
** In the anime filler, the Bounts were born many centuries before the current storyline during a lab accident in Soul Society. The shinigami responsible for this [[spoiler: Ran Tao]] has an even more extended lifespan than normal shinigami due to the aid of science.
* Holo from ''LightNovel/SpiceAndWolf'' is a centuries-old wolf god who assumes the form of a teenage girl.
* In ''Anime/RevolutionaryGirlUtena'', while we do not know just how old [[spoiler:Akio and Anthy]] are, it is clear that they have been around for a long time, possibly as long as the very concepts of 'Prince', 'Princess', and 'Witch'. Same goes for [[spoiler:Mikage]], though he may have been DeadAllAlong.
* Son Goku in ''Manga/{{Saiyuki}}'' was been imprisoned in a rock for 500 years without aging before being freed by Sanzo. Goku's apparent age is supposed to be 18, but he looks 12.
* Deconstructed in ''MermaidSaga''. Because the immortal Masato is stuck with the body of a young boy, he can't get by in society without a caretaker, which he often quickly outlives. He can't stay in one place for more than two years for risk of raising suspicion to his nature. He eventually goes nuts over having to deal with this for over eight hundred years.
* Chizuru in ''LightNovel/{{Kanokon}}'' is 400 years old, yet looks (and acts) like an 18 year old. After all this time, she's ''still'' a virgin.
** Don't forget about Nozomu, who is stated to be 200 years old, despite looking like an elementary student.
* The Mu in ''Manga/TowardTheTerra'' can keep a youthful appearance despite living much longer than normal humans. Namely Blue who is 300 years old.
* In ''LightNovel/KyoKaraMaoh'' the Mazoku live many a century and age at a much slower rate than humans do. A radical example would be Ulrike who is 800 years old yet looks like a little girl. Somewhat subverted in Ondine's sister who does look quite old despite the fact that her sister, who is even older than Ulrike, still seems very much like a kid. An interesting case is [[spoiler:Murata who looks like a teen yet has memories from several reincarnations going back millennia]].
** In the anime, at least, we are told that ordinary Mazoku age about 1 human year for every 5 years they live (hence Wolfram is in his 80s but seems to be about 16 or 17). Ulrike and Ondine's positions as ''Genshi Miko'' (basically high priestesses) seem to have allowed them to age even slower, hence Ondine appearing so much younger than her own twin sister.
* Miyu in ''Manga/VampirePrincessMiyu'' is tragic example of this trope. She looks thirteen years old, [[spoiler:but her growth was magically stunted by the Shinma so she can hunt the ones who ran away to the human world and take all the time in the world to do so]].
* Czeslaw Meyer of ''LightNovel/{{Baccano}}'' looks like he's ten years old. In hindsight, he probably should have waited a little longer before drinking the elixir of immortality in 1711...
** Of course, he's far from the only one, even if he's the most extreme case. There are quite a few characters (Huey, Elmer, Maiza, etc.) that drank the same concoction, making most of them at least 250 years old by the time the series starts. There's also Firo, who already had enough trouble [[OlderThanTheyLook passing for his actual age]] ''before'' immortality...
** However, unlike the others, the only thing Czeslaw really gained from his immortality was the ability to survive [[BreakTheCutie ''years'' of torture]]. Added on to 200+ years of eternal childhood and, well... [[BlessedWithSuck sucks to be him]]. In comparison [[spoiler: Sylvie]], who while still immortal, deliberately waited until she was in her twenties to become so to avoid spending eternity as a teenager. Look at Czeslaw's experience and say that this wasn't a good move.
* Master Karin of ''Manga/DragonBall'' looks like an ordinary house cat (albeit a [[FunnyAnimal walking, talking]] house cat) but is really over 800 years old.
** Master Roshi (aka Muten Roshi), despite looking in his 70s since the start is actually ''300 years old'', as is his rival the Crane Hermit and ''his'' brother Mercenary Tao. Roshi and Crane are old enough to have been young monks when King Piccolo ravaged the Earth 300 years ago. Garlic and his son Garlic Jr., nemeses to Kami in a NonSerialMovie and anime filler are also at least 300 years old. And if you think that's astounding, Roshi's older sister Uranai Baba, is ''500 years old''. In anime {{filler}}, Roshi's turtle celebrates his one thousandth birthday. Mr. Popo has been attendant to every Guardian of Earth (or at least a large number), so he's much, much older.
** The Nameless Namekian separated into Kami and King Piccolo 300 years ago, having already been about 200 when this happened. Non Serial Movie villain Lord Slug and Namekian elder Guru (who actually ''does'' look his age) is also from this time. Oddly enough, prior to remerging with Kami, Piccolo Jr., King Piccolo's reincarnation was about 14 years old (though he had already merged with an older Namekian in the Frieza saga). Namekian merging is... complicated.
** The Kais are in the millions of years old. The Eastern Supreme Kai killed Bibidi, the creator of Majin Buu, five million years ago, making Bibidi's son Babidi at least that old. Numerous other demons and deities from both the original manga and anime filler are likely at least as old.
*** Old Supreme Kai takes the cake here, as he's ridiculously old even by Kai standards. He actually does look pretty old, but he counts his age as "15 generations". Logically, he'd be talking about ''Kai'' generations. Considering that Eastern Supreme Kai has not visibly aged in 5 million years, this would be an [[TimeAbyss unbelievably long time indeed.]]
*** Furthermore, the age he's showing is not his own. He accidentally fused with an old witch when he was young, and has looked that old ever since.
* ''Manga/{{Trigun}}'' has [[spoiler:Vash and Knives]], who look in their mid-twenties despite being over 130 years old in the anime and over 150 years old in the manga. It's also unspecified just how old [[spoiler:(manga only) Chronika/Kronika and Domina]] are, but they might be over a century (they also look in their mid- to late twenties, while [[spoiler:the twins]] still looked like teenagers when they were 'only' eighty years old).
* ''Manga/FullmetalAlchemist'' has the Really Four Hundred Years Old [[spoiler:Hohenheim]], who perpetually looks in his thirties or forties. The manga also has [[spoiler:Father]], who looks about twenty years older than the former, and the anime has [[spoiler:Dante, Hohenheim's repudiated wife]]. Most of the homunculi count too, especially [[spoiler:Envy in the anime (400+ ), Pride/Selim in the manga (400+ but the body of a little boy), and Greed (200+ ) in most of his incarnations]].
** Ironically, in the manga, the oldest Homunculus, [[spoiler: Pride, has the appearance of a 6-year-old]], whilst the youngest Homunculus [[spoiler: (discounting Ling as the second Greed), is Wrath, the oldest-looking of the Homunculi - who happens to be the only one that actually looks his age.]]
* The eponymous character from ''ImmortalRain'' looks to be in his twenties, but has been alive for the past 200 years. Same goes for the villain, the literal Methuselah, who has been endlessly reincarnated since the beginning of humanity.
* ''Anime/TengenToppaGurrenLagann'' has Lordgenome, who looks to be no older than his early forties, but is actually at least 1000 years old.
** This is the case for all the Beastmen, considering that Cytomander can be referred to as a fledgeling despite being over 200 years old and Guame is only a few years younger than Lordgenome. (Although Guame at least looks elderly, at least as far as one can tell with an anthropomorphic armadillo)
* ''Manga/{{Claymore}}'' has Isley and Riful, who look like a [[{{Bishonen}} handsome young man]] and a [[CreepyChild little girl]] respectively despite being centuries old, not to mention [[WasOnceAMan not even human.]]
* The trope name is exactly true for Caerula Sanguis from ''[[{{Gunnm}} Battle Angel Alita: Last Order]]''. Her age is actually quite significant. She has spent most of them learning and refining both her [[LadyofWar wu shu straightsword techniques]] and her [[BatmanGambit comprehensive combat strategies]] in the service of protecting humankind.
* Subverted in episode two of otherwise softcore (by modern standards) ''TheElvenBride''. When the eponymous elf was asked about her age, she replies seventeen, to which the girl pointed out that seventeen elf years is long in comparison to human years. She promptly explains that she has only lived 17 human years since she was born.
* Many of the protagonists from Tsutomu Nihei's ''Blameverse'' stories, due to being advanced cyborgs. Sosono Musubi of ''Noise'' goes on to live for millennia after being upgraded by The Safeguard. Killy from ''Manga/{{Blame}}'' is at least 3,000, but he doesn't realize it because his brain has run out of space several times and had to be overwritten.
* Taikoubou from ''Manga/SoulHunter'', despite looking like a teenager, is revealed right in the beginning to be an immortal who is 72+ years old. However, it is later revealed that he is [[spoiler: much older than even that when he returns to being Fukki, one of the First People (an ancient alien race)]].
* ''Webcomic/AxisPowersHetalia'' [[MagicRealism isn't very clear about how age applies to its characters]], but China's profile says that he's 4,000 years old and he doesn't look much older than his mid-twenties.
** "I've loved you since the 900s." -Holy Roman Empire to Chibitalia.
*** Since the nations have been shown in different historical events at different times, it's safe to assume that they're more than a century or two old.
** [[WordOfGod The author]] has explicitly stated that China is immortal.
** There are also WordOfGod "human ages" for several of the characters, placing most of the characters biologically in their twenties – for instance, America is 19, Italy and Germany are both 20, and England is 23 – but China alone is listed as 4,000 years old and immortal. Countries seem to age according to both how old they are and how quickly the country develops; Italy was a small child for (presumably) centuries, but England received quite a shock when he left a tiny America and came back after a few decades to find one that was taller than him.
* Beelzebub, the most feared demon (behind [[Manga/DragonBall Dabura]]) in the ''SandLand'' is somewhere around 2,000 years old but is still considered a child and has a bed time.
* Mito of ''Anime/SpacePirateMito'' is an alien that is over ten thousand years old, but looks like she could be in third grade.
* ''Manga/{{Hellsing}}'':
** Alucard. He's a 567-year-old vampire at the start of the series, and he looks to be in his early forties at ''most''. This depiction of his age has historical basis. The real Vlad Dracula died in battle in 1476 at the age of forty-five. In ''Hellsing'', his backstory is that instead of dying in battle, he was captured and to be executed, but chose to defy his fate and become a vampire instead.
** In the prequel manga series ''Hellsing: The Dawn'', Alucard takes the form of a 14-year-old girl.
** Don't forget Helena from the anime. She appears to be a prepubescent girl somewhere between twelve and fourteen years old, apparently because she was turned into a vampire at a very young age, and has been around for a very, ''very'' long time. Just how long is never determined, but it's implied that she is one of the oldest vampires ever seen in the series.
** Seras in the manga/[=OVA=] is beginning down the road to this trope. She was about 20 when she became a vampire. In the epilogue, 30 years later, she still looks the same (in contrast to Integra, who's visibly older).
* In ''Manga/{{Nobunagun}}'', the DOGOO Commander is almost 1,800 years old, while her assistant Saint-Germain is around 1,000 years old. In the Commander's case this is due to several centuries-long periods of stasis that she underwent while combing through history looking for individuals to turn into E-genes, while Saint-Germain is implied to have CompleteImmortality.
* In ''Anime/NeonGenesisEvangelion'', Ayanami Rei has a 14-year-old body, but the soul of an entity that is ''billions'' of years old. So does Kaworu.
** Keel Lorentz, the head of [[AncientConspiracy SEELE foundation]], is rumored to be an Eternal Jew himself. Though he leaves enough of the [[HollywoodCyborg high-tech implants ]]during the Instrumentality.
* ''Manga/InuYasha'': {{Youkai}} have lifespans that are vastly in excess of human lifespans. Even child characters such as [[{{Kitsune}} Shippou]] have been around for decades despite their biological youth. Teen characters such as Sesshoumaru have been around for centuries. Even a HalfHumanHybrid has an unnaturally long lifespan. The {{canon}} never gives Inuyasha's age, but a flashback to his mother shows she wore the clothes of a Heian noblewoman, and that era died out 500 years before the story's setting ([[{{Filler}} the anime gives him an age of 200]]). [[BigBad Naraku]] [[HalfHumanHybrid himself]] has been around for decades at least.
* Washuu Ryuugasaki, the school principal in ''Anime/CyberTeamInAkihabara''.
** Don't forget Crane Bahnsteik and Cigogne Ratspieu.
* Cassian from ''{{Godchild}}'' is really thirty-five, but a medical condition caused his body to stop growing just before he hit puberty.
* [[http://www.onemanga.com/Katekyo_Hitman_Reborn/254/03/ The entire Arcobaleno]] of ''Manga/KatekyoHitmanReborn'' apparently.
** Another character is far older than he appears: [[spoiler:Kawahira belongs to a race of pre-human Earthlings and is responsible for every generation of Arcobaleno]].
* All the vampires and dampirers from ''Manga/TheRecordOfAFallenVampire'', with the exception of [[OlderThanTheyLook Laetitia]], who's only in her 60s.
* Cheza in ''Anime/WolfsRain'' looks to be about 13 or so, but is actually around 200 years old. Lord Darcia and his lover Hamona are also several centuries old, but appear to be in their 20s.
* In ''Manhwa/ChroniclesOfTheCursedSword'', [[MorallyAmbiguousDoctorate Dr.]] [[MadDoctor Laobi]] looks like she's in her mid-twenties, but is late found to be about 150 and [[spoiler: the mother of the BadassGrandpa and OldMaster.]] She keeps herself looking young with [[ForScience Science]].
* Melchisedec, Carmichael and the Emilys in ''Anime/StrainStrategicArmoredInfantry''.
* Elda Marker from ''Manga/{{Karin}}''. In fact, she looks younger than Karin herself, despite being unspeakably old.
* In ''Anime/YuGiOh'' Dartz looks twenty despite being 10,000 years old.
** Yami and Bakura might fall under this trope as well, but technically, they're spirits inhabiting the bodies of two 16-year-olds.
* Klan Klang from ''Anime/MacrossFrontier'' is an odd example. In her natural [[AttackOfThe50FootWhatever Zentraedi]] state, she looks the right age (BoobsOfSteel aside), but when [[IncredibleShrinkingMan micronized]] to human size she looks like a 10- or 12-year-old because of a genetic defect. This actually inhibits a potential relationship with her crush [[ChivalrousPervert Mikael]], who points out that if they got together, [[{{Lolicon}} he'd be arrested]] - which earns him a DopeSlap from the unhappy Klan.
* Dragons, like Filia and Valgaav, and ''Mazoku'', like Xellos, are either long-lived or immortal in ''LightNovel/{{Slayers}}''; Xellos is well over a millennium old, Valgaav is shown to be at least as old as Xellos, while Filia is several hundred years old, but not as old as Valgaav (which is pointed out in the anime, when she is shown tidbits of Valgaav's childhood). While elves also live at least twice as long as humans do, some human sorcerers with a lot of magical power can live for a century or two. Finally, chimeras can live for ages or die quickly, something that was [[WordOfGod addressed by the light novel author]]. In theory, if [[JerkWithAHeartOfGold Zelgadis]] were to remain a chimera for the rest of his life, he could live for several hundred years.
* The BigBad Liselotte Werckmeister from ''ElevenEyes'' has been around for 800 years due to her immortality.
* Mephisto Pheles of ''Manga/BlueExorcist'' [[spoiler:is said to have been working with the exorcists for around 200 years at this point. He is probably even older than that.]] He looks more like he's in his thirties - sometimes a little younger or older.
* One chapter of SayonaraZetsubouSensei shows a [[FlashForward brief glimpse fifty years into the future]] in which the former students have noticeably aged (Nami and Mataro are white-haired and wrinkled, Usui is almost completely bald, Kaede is shown in silhouette but has a granddaughter). Then there's [[spoiler: [[NightmareFuelStationAttendant Kafuka]],]] who hasn't changed. ''At all''.
* Akasha Bloodriver from ''RosarioToVampire'' looked to be in her late twenties at the oldest... and looked exactly the same 200 years ago. Same goes for the other Dark Lords, though Fuhai plays with this a bit by having a SleepModeSize body that looks like a MiniatureSeniorCitizen.
** The [[AnIcePerson Snow Priestess]] is well over 100, but looks 30-40.
* The Wolkenritter of ''LyricalNanoha'' have existed for centuries at least but look like they're in their twenties. [[LittleMissBadass Vita]] is an extreme case.
* Tomoe from ''Manga/KamisamaKiss'' looks to be in his late teens, early twenties but has been around for over five centuries.
* [[HotWitch Arachne]] from ''Manga/SoulEater'' is over 800 years old. You sure as hell wouldn't be able to tell by looking at her.
** The same goes for Asura, on the occasions he comes across as more 'human' than [[HumanoidAbomination 'abomination']].
* Demons in ''Manga/TheWorldGodOnlyKnows'' are several hundred years old, but look and act like teenagers; except for Elsea, who [[ImmortalImmaturity acts like an eight-year-old]].
* In ''LightNovel/DragonCrisis'' Maruga, the White Dragon Empress looks to be in her late teens/early twenties, but she knew her uncle, who died over a hundred years ago, which means she is over a hundred years old. Onyx, who was Maruga's childhood friend would also be over a hundred as well.
* In ''Manga/{{Toriko}}'', the three disciples of Acacia (Ichiryu, Jiro, and Midora) are at least over 200 years old. They certainly don't look it, and they're some of the most powerful people in the series.
* Considering that half the characters in MythicalDetectiveLokiRagnarok are gods or monsters from Myth/NorseMythology, this is to be expected. Though, most of them [[ImmortalImmaturity certainly don't act like it]]. Then again, they don't in the original myths either...
* PlayedForLaughs in ''LightNovel/LoveChunibyoAndOtherDelusions'', where Shinka, when she was in her MsImagination persona "Mori Summer," claimed of 700 years old more than she actually is and was the only living mage in the world.
* ''Manga/HekikaiNoAion'': Seine is 300 years old and has an appearance of a teenager.
* ''GateKeepers''' Houjou Yukino looks like a ten year old even though she's more than eight hundred years old.
* Shrine Maiden Ulrike, from ''LightNovel/KyoKaraMaoh'', is 800 but looks like a young girl. Ondine, the maiden before Ulrike looks ''even younger''.
* King and his sister, Elaine, from ''Manga/TheSevenDeadlySins'' have the appearance of little kids, but they are both much, ''much'' older than what they look like. They're at least over seven hundred years old, for those curious.
* THE ENTIRE MAIN CAST of LightNovel/HaruhiSuzumiya, due to a time loop that made them live for over 600 years. Only one team member actually REMEMBERS all those hundreds of years, making her the only one likely to TRULY be 600+. Haruhi/Kyon might be if they are the godlike being/s the whole series is revolving around. In fact, with them, it might be a TimeAbyss that neither can remember.
** [[spoiler:Mikuru never told us her real age, not to mention her possibly far past adult self doing the same.]]
* ''LightNovel/{{Campione}}'' has Divine Ancestors, goddesses who were trapped in the form of pre-pubescent children when a god usurped their position. Many spend centuries seeking to regain their power, never aging unless they sacrifice their eternal youth to [[ScaledUp become a dragon]].
** The two female Campiones also qualify, appearing to be in their teens but having actually lived centuries.
** Pandora, the goddess who watches over the Campione ritual and asks them to treat her as their mother, looks like a young child. The ritual has been in place for centuries.
* From ''Manga/{{Naruto}}'' we have the Toad Sages: Fukasaku, Shima, and the Great Toad Sage. Fukasaku and Shima are ''800 years old'' while the Great Toad Sage is ''1000 years old'', making them the oldest lived beings next to the ''Biju'' which are ''thousands of years old''.
* [[OurVampiresAreDifferent The Pillar Men]] of ''Manga/JoJosBizarreAdventure''. They all pre-date human civilization(their oldest being [[TimeAbyss over 100,000 years old]]), but look like at most 30s-year old [[HornedHumanoid men with horns.]] To a lesser extent there's [[BigBad Dio]] [[TimeSkip in Part 3]], who's 120 while still looking in his mid-20s.
* While ''Manga/CatGod'' is full of gods and spirits that are older than they look, Shamo is a standout case as she's noted to be an influential god and notes when meeting Yuzu that she's the first person to treat her like a child to the extent she did (giving her a bath, sewing up her stuffed animal, etc).
* In ''Animation/GuardianFairyMichel'', Michel looks like a young boy but is as old as the Earth itself.
* ''Manga/ArataKangatari'' has Princess Kikuri, who looks 8 years old but is really around 60 years old. There are also the 12 Shinsho, who, when given their Hayagami, stop aging. For example, Kikutsune is over a thousand years old and looks 17. And then there's Kugura, who found his Hayagami Shinado when he was 13, and since then has remained in the form of a 13-year old, despite being older than 300.
* The devil Koumoto Akane from ''Manga/MyMonsterSecret'' claims that she is over 1000 years old, yet looks like a grade-schooler, despite being the principal of the school. Her mostly-human great-great-granddaughter Akari doesn't share this trait, however, making her look far older than her own ancestor, enough to be the butt of ChristmasCake jokes. The angel Shirogane Karen's age is more vague, but she is already around even since Akari was born, likely making her this trope as well.
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