This character is immortal, but not because he is NighInvulnerable or can regenerate any injury, even FromASingleCell. He is immortal because he doesn't age, nor does he usually sicken. This character will never die from ''natural'' causes.

However, he is just as vulnerable to injury as a normal person, and any normally fatal injury will prove fatal to him as well. There are sometimes instances where this trope occurs alongside ResurrectiveImmortality, in which case putting him down permanently usually requires some especially extraordinary means.

This is frequently a racial trait of [[OurElvesAreBetter elves]] and almost always a feature of {{robot}}s and [[OurVampiresAreDifferent vampires]].

Frequently overlaps with ImmortalityBeginsAtTwenty. Also frequently overlaps with immortality by HealingFactor, to the point here it's more unusual to find someone with a Healing Factor ''without'' slowed or stopped aging than with it.

If this trope is combined with [[NighInvulnerability invulnerability]], it becomes CompleteImmortality.

This is a subtrope of {{Immortality}}.

Compare LongLived, Really700YearsOld.

Contrast LifeDrinker, which involves stealing lifeforce from victims to maintain immortality, rather than the non-aging being an innate trait to begin with.

----
!!Examples:

[[foldercontrol]]

[[folder:Anime and Manga]]
* Sasori from ''Manga/{{Naruto}}'', because he turned himself into a puppet.
* Edermask from ''Webcomic/{{Magician}}''. Not even he knows exactly why.
* ''TowerOfGod:'' Being in the Tower and using Shinsoo does that to you after a while.
* The Innovators, artificial humans from ''{{Gundam00}}'' whose aging is controlled by gene manipulation and nanomachines.
* Master Roshi and Fortuneteller Baba from ''{{Dragonball}}'', both having drank from the Fountain of Youth.
** King Piccolo first mentioned wanting to wish for eternal youth from Shen Long so he could rule the world forever, but for some reason when he got the balls he changed his wish to just having his youth ''restored'' (he was even stated to be holding back against Goku at first because fighting as full strength makes him age faster).
** Androids #17 , #18, and #20 are this due to their {{cyborg}} status. #17 and #18 were captured as runaway teenage humans and turned into this by Dr. Gero's experiments, whereas Gero had his own brain transferred into the robotic #20 body.
* The case for gods in the ''Manga/{{Saiyuki}}'' series.
* In ''{{Robotech}}'', the Zentraedi apparently have biological immortality due to a protoculture-based genetic engineering, despite having a life expectancy lower than humans due to being a ProudWarriorRace and MartyrdomCulture.
* The demons of ''ChronoCrusade'' appear to be this. There's some indication that they ''do'' age, but if so it's very slowly--they look the same age even over a span of 60 years.
* Seine from ''Manga/HekikaiNoAiON''. Sadly, she's stuck forever in [[NotGrowingUpSucks a 15-years-old body]].
* ''Franchise/LyricalNanoha''
** A common trait of the [[RidiculouslyHumanRobots Ridiculously Human]] {{Magitek}} programs in the series, such as the Wolkenritter, Reinforce, Agito, and the Materials. Whether or not they overlap with other forms of immortality varies, but all of them have lived since the days of Ancient Belka, with their apparent age changing only if they want it to.
** ''Audioplay/StrikersSoundStageX'' introduces King Ixpellia. She has the same child-looking appearance she has now as she did when she ruled as Garea's figurehead king hundreds of years ago, although it is unknown if she has any other form of immortality since she's kept away from the front lines.
* The enigmatic magician Clow Reed from ''Manga/CardcaptorSakura'', ''TsubasaReservoirChronicle'', and ''{{xxxHOLiC}}'' maintained his fairly youthful appearance for the duration of his several-centuries-long life with his vast powers. His apparent counterpart, the Dimension witch, Yuuko Ichihara is similarly unaging, [[spoiler: although the reason for it in her case is because Clow Reed [[PowerIncontinence accidentally]] trapped her in a state where she's neither truly dead nor alive.]]
** [[spoiler: When Watanuki succeeds Yuuko as owner of the wish shop, he also ceases to age.]]
* In ''Anime/PrincessTutu'', Mytho never ages after he escapes from the [[ShowWithinAShow Story Within The Story]] into the real world.
* In ''Anime/RebuildOfEvangelion 3.0'', this is apparently a side effect of [[spoiler:piloting an Eva: the pilot's physical age is fixed at that point. This results in a 28-year-old Asuka and Mari still having the 14-year-old bodies they had in the last film. Asuka refers to it as "the Curse of Eva".]]
* In ''Manga/OnePiece'', the Hobi Hobi no Mi (Hobby-Hobby Fruit)'s main power is to turn people into toys, but it also has the side-effect of halting the aging process, effectively granting eternal youth. The current user, [[spoiler: Sugar of the Donquxote Pirates]], ate it as a child, and thus still is one physically.
* In ''Manga/SamuraiDeeperKyo'', all Mibu clan members share this trait to certain degree. [[spoiler: Tokito, a member of Taishirou is this due to a technique that reverse her age and stop her growth to halt deadly disease in her body.]]
* All Crimson Denizens and Flame Hazes are this in ''LightNovel/ShakuganNoShana'' and their protagonist is a special case who get this status due to treasure tool called Midnight Lost Child.
* In ''Anime/TweenyWitches'', Eva and Sheila were punished by being made ageless. Arusu didn't see what was so bad about that, until they pointed out that since they can't grow up, they can't reach their full magical potential, not to mention they won't be able to do adult stuff like get married.
[[/folder]]

[[folder:Comic Books]]
* The Elves in ''ElfQuest'' (except for [[spoiler:the Wolfriders, who for most of their history were more likely to die in battle with humans anyway]]) do not die of old age, however, sickness occasionally happens, e.g. [[spoiler: Krim's first child died as an infant.]]
* Many immortals of the DCUniverse, including the NewGods and the [[WonderWoman Amazons]].
* In the titular world of {{Felarya}}, ''everyone'' has this due to the magical properties of the world. Unfortunately for those who come to Felarya seeking immortality, it it [[DeathWorld very easy to die there.]]
** The planet Iego in the ''StarWarsExpandedUniverse'' works in the exact same way.
* The MartianManhunter, like all Martians, ages much slower than humans do, as he is several hundred years old and is still in his prime.
* Comicbook/DoctorStrange got into a fight with Death itself, accepted its inevitability, surrendered to it, and CameBackStrong. He is told that, as a result, "death may only come from without, in battle -- and not from within."
* From the MarvelUniverse, NickFury. His brand of immortality stems from the Infinity Formula, for which he was the lab rat during World War 2 (without his consent, he was half-dead at the time, having just stepped on a landmine). The formula took about a quarter of a century to work on his biology, and now, although being nominally 90 years old (born 1917-1918) he is physically in his 40s, 50s tops and will not age another day. He can however be wounded, and presumably killed; nobody really achieved that, since he's ColonelBadass, with an EyepatchOfPower.
* Nick Fury's ArchEnemy Baron Strucker, the leader of the terrorist organization HYDRA, also has repressed aging thanks to a serum.
* Captain America, who ages far more slowly due to the super soldeir serum in his veins, but can die like anyone else.
** His ex-sidekick, Bucky Barnes, was injected with the same Infinity Formula (in fact, it was the last of it) as Nick Fury, but is as vulnerable as your average soldier.
* Black Widow has slowed aging thanks to an experimental formula used on her.
* A number of entities in ''ComicBook/TheSandman'', starting with the Endless (who are {{Anthropomorphic Personification}}s of primal concepts and can be killed through extraordinary means, but will be reborn as another "aspect" of themselves with a slightly different appearance and personality) on down through gods, angels, and devils, who can die because GodNeedsPrayerBadly but not because of aging, and down to folks like Hob Gadling, who is otherwise totally human but does not age and cannot die due to a bet between Dream and Death. Some immortals don't even know ''why'' they don't age; they just ''don't''.
[[/folder]]

[[folder:Fan Fiction]]
* [[spoiler: The Genesis Samurais]] from ''FanFic/ClashOfTheElements'', who haven't aged for over two-thousand years.
* The Flutter Ponies in ''Fanfic/TheElementsOfHarmonyAndTheSaviorOfWorlds'', meaning that after the [[spoiler: [[YearInsideHourOutside 1500 years that have passed for Equestria compared to 20 for Earth]]]], those friends of Megan's are still around. The same is true of the Princess Ponies, but in their case it's because of the Heart of Ponyland [[ImmortalityInducer sustaining them]]. Apparently so do the Bushwoolies that serve as their honor guards.
** [[spoiler:Catrina and Rep.]]
** [[spoiler:Sting]]
* Twilight Sparkle and Shining Armor in ''FanFic/HarmonysWarriors'', who both appear the same age in ''[[Film/CaptainAmericaTheFirstAvenger Captain Equestria]]'' (which is set in the 1940s), ''[[Film/XMenFirstClass X-Questrians: First Class]]'' (set in the 1970s) and all the present day stories. Apparently, this is due to [[Main/SuperSerum a serum]] Twilight had created.
[[/folder]]

[[folder:Film - Live Action]]
* ''Film/TheFountain'': Tom Creo has lived for 500 years without aging by eating the bark of a special tree.
* In ''Film/IndianaJonesAndTheLastCrusade'', drinking from the HolyGrail grants you this form of immortality. There's a downside, however: [[spoiler:The elderly crusader explains that yes, you live forever - but only so long as you remain in the grail's sacred area. You must drink from the Grail periodically to rejuvenate yourself (hence why Indy and his dad aren't immortal despite drinking from it). Since it can't be taken from its sacred area, obviously you need to stay relatively close to that area to keep drinking from it.]]
* ''Film/InTime'' features a humanity that has stopped the aging process, freezing everyone's age and physical abilities at 25. Time itself has replaced money as currency, meaning that the poor live day to day, while the rich can effectively become immortal.
* John [[PunnyName Oldman]] from ''TheManFromEarth'' says he is this, as he claims to be a [[TimeAbyss 14,000 year old caveman]] who has survived until the current day while looking about 35 for no particular reason except he just hasn't died. He has no idea if he has a HealingFactor or not (having avoided situations where he could test that) although he does know that he doesn't scar. [[spoiler:After initially claiming that he was lying all along, the last few minutes of the movie reveal that he is at least old enough to ''literally'' be the father of a coworker who looks to be in his 60s or 70s.]]
* The puppets in ''Film/PuppetMaster'' are brought to life by an ancient Egyptian spell found by Andre Toulon. The spell apparently works on humans as well, but they are only invulnerable to aging. This also applies to the puppets as they can be damaged to the point of death.
* In the 2010 ''Film/ClashOfTheTitans'', Io was cursed by the gods with agelessness. She mentions the burden of [[WhoWantsToLiveForever living on while her loved ones grew old and died]].
* ''Film/XMen'':
** ''Film/XMenFirstClass'':\\\
[[BigBad Sebastian Shaw]], whose energy-absorbing powers keep him young... somehow.\\\
Also Raven Darkholme to a point, who ages at a very slow rate due to the ability of her cells to alter their function, which makes more sense than Shaw's immortality in the framework of the established rules of the universe.\\\
Logan already being roughly 130 years old in 1962, and only appearing around thirty-five, when a young Charles Xavier and Erik Lehnsherr attempt to recruit him in a bar. ''Forty years'' before he ends up actually joining the X-Men.
** ''Film/TheWolverine'': Ichirō Yashida became obsessed with becoming this after meeting Logan back during World War II.
[[/folder]]

[[folder:Literature]]
* ''Literature/TheLordOfTheRings'' and ''Literature/TheSilmarillion'':
** The elves have an unending lifespan until the world ends, have the vigor and strength of a human in his prime even when thousands of years old (though they may outwardly age under years of torture, as Gwindor in ''Silm''), and do not get sick. They only die if slain or by wasting away from grief. Even death isn't always permanent; after an elf's spirit has spent some years in the Halls of Waiting, if they have thoroughly repented and learned from any sins they comitted, they get re-embodied -- this, however, is not an inherent power but a grace provided by the Valar (the godlike archangels of Arda).[[note]]The only "aging" they experience is "fading," which slowly turns them intangible but takes tens of thousands of years to even start. But this only happens to those who stay in Middle-earth, and it isn't clear that it's anything inherent to the elves themselves.[[/note]]
** Ainur (Valar and Maiar) are ageless within the world, and will continue in perfect youth until the end of the world.
** Ents are just as long-lived as elves, as Treebeard explains to the hobbits. They have a tendency to get sleepy and tree-like, but they never age.
** In the Blessed Realm of Aman, all animal and plant life remains in a state of youthful adulthood after reaching maturity. The Hounds of Oromė, which [[MaybeMagicMaybeMundane may or may not just be dogs]], are as ageless as elves.
** Dragons can be killed but they never die from natural causes. They aren't exactly ageless, but they only get StrongerWithAge.
* Morc, in the ''De Dannan Isles'' books.
* The sorcerers of the ''{{Belgariad}}''.
* The Immortals of TamoraPierce's ''Literature/TortallUniverse'' books, which include creatures from centaurs to dragons. First seen in ([[ExactlyWhatItSaysOnTheTin wait for it]]) ''Literature/TheImmortals'' quartet.
* The Amber Royalty from ''Literature/TheChroniclesOfAmber'' are mostly this. They are quite tough and regenerate better than humans, but it's a very slow process (it takes four years to [[spoiler:grow back burnt out eyes]], for example). Serious wounds definitely can kill them, which happens on several occasions.
* The Remillard Clan from Julian May's ''Literature/GalacticMilieu'' series. Each one appears to stop getting older at a different age. They have minor regenerative powers, but they can still be seriously injured or killed.
* The majority of the Wilds from TrudiCanavan's ''Literature/TheAgeOfTheFive'' trilogy fall into this category. The most extreme example is [[spoiler: The Gull - the oldest of the Wilds, who has the physical body of a prepubescent child]].
* In the ''Literature/{{Indigo}}'' series, may be true of Indigo and [[NonhumanSidekick Grimya]]--they do not age, but even they don't know whether they can be killed by injury or disease. At one point, Indigo is seriously ill and comatose, and Grimya worries that [[FateWorseThanDeath she will remain delirious forever]] if the disease "kills" her. (Indigo recovers, and the question is never resolved.)
* ''{{Warbreaker}}'':
** The Returned can continue to live indefinitely if they are supplied with [[LifeEnergy Breath]] once per week but are otherwise as vulnerable to injury as anybody else, [[spoiler: as poor Blushweaver discovered]].
** ''Anyone'' can live indefinitely if they have the Fifth Heightening or above, and in fact it's explained that the Returned immortality works like it does because a Returned has a single, immensely powerful breath that puts them automatically at this stage (People with less than that age more slowly, but the Fifth Heightening is when it stops completely). It's actually better than being a Returned since such people don't need a constant supply of Breath to live (though they do need to gather a lot of Breath in the first place to ''reach'' the heightening, their bodies don't consume it once they have it and they can use it indefinitely).
* The Immortal Vermin of Creator/BruceCoville's ''Literature/MagicShop'' series are this type. Bufo, the first of the Immortal Vermin to appear, says he can be killed, but barring such an incident, he will live forever. Jerome and Roxanne, the youngest of the Immortal Vermin, inform the protagonists of "The Skull of Truth" and "Juliet Dove, Queen of Love" of their status as "killable, but otherwise undying". (It may also be mentioned in the updated version of "The Monster's Ring".)
* In ''Literature/TheLastUnicorn'' the title character is immortal but can be killed by anything from a dragon to a stray arrow.
* Norna-Gest from the Old Norse ''Literature/TaleOfNornaGest'' gains this kind of immortality by exploiting the ExactWords of a [[CurseEscapeClause norn's curse]].
* Dragons in ''TheObsidianTrilogy'' are this. They do not age or get ill, but they can be injured and killed. If they chose to bond with a human or elven mage, they will also die when their bondmate does.
* In ''[[http://www.amazon.com/third-millennium-history-world-2000-3000/dp/0283992115 The Third Millenium: A History Of The World 2000 - 3000 A.D.]]'', The Emortals and Starpeople achieve temporary biological immortality through genetic engineering and the rejuvination procedure; most who don't die by accident will eventually die from a failed rejuvination, but they typically remain youthful to about age 400 - 500.
* In LoisDuncan's ''Locked in Time'', Lisette and her children have eternal youth but not eternal life.
* The Lord Ruler from ''Literature/{{Mistborn}}''. He can literally store up youth and health [[spoiler: by using Feruchemy]] for later consumption, making him both ageless and virtually impervious to injury. [[spoiler: In the end, [[ActionGirl Vin]] kills him by tearing away his storages - so she almost literally rips the vitality out of him]].
** Also the kandra, at least as far as we know, they are also rather tricky to kill by injury due to their ability to close wounds using their shapeshifting powers, the best way to kill them seems to be acid.
* The ''Literature/AlexBenedict'' novel ''Polaris'' has the scientist Dunnager, who was seeking a way to halt the aging process and was reportedly very close to succeeding when he mysteriously vanished without a trace and his lab burned down. [[spoiler:It turns out he did succeed, and a number of people rendered ageless by his work conspired to keep it secret]].
* In ''Literature/DirgeForPresterJohn'', no one who drinks from the Fountain three times will age beyond their third visit.
* In Max Frei's ''Literature/LabyrinthsOfEcho'':
** Khrebels, the pure spirits. Effectively immortal, possibly vulnerable only to the destruction of their world.
** As the mysterious World's Heart pierces the planet like a rod, two entities inhabit the ends - the Spirit of Kholomi in Echo and an unnamed entity on the opposite end. Both are probably immortal unless the world is destroyed.
** Pure-blooded elves. This doesn't extend to their offspring with other sentients, leading to dramatic scenarios and the creation of Kharumba.
** True Magic users of sufficient power, e.g. Maba Kalokh.
** Ancient Magisters, e.g. Khabba Khän.
* The controlling entities in Iar Elterrus' ''9 Swords'' {{Multiverse}} are each split into Will, Power and Knowledge. While Knowledge incarnates as one of the eponymous Swords and is [[CompleteImmortality indestructible and immortal]], Power incarnates as an ageless dragon. In contrast, Will incarnates as a mortal human, which means that every coming of the entity has the same Power and Knowledge driven by a new Will.
* In Vadim Panov's ''SecretCity'':
** Nav', although mortal and with some {{WeaksauceWeakness}}es.
** Divine Lords of Tat'. While vulnerable to both regular and magical harm, their power levels and personal brands of TakingYouWithMe which inflict damage on geological scale serve as a strong deterrent.
** Possibly the Asura, although their surviving contemporaries, Nav' and Tat', are unreliable sources of information at best.
** The last couple of Osara, [[HiveQueen king and queen]] of the common Os'. This is at least partially caused by Nav' meddling.
** "Flying Dutchman's" crew - they are ageless and maybe truly immortal until they either voluntarily leave the ship or fulfill the CurseEscapeClause.
* Various elves in contemporary russian fiction, too many to count.
* The huntresses of Artemis in ''Literature/PercyJacksonAndTheOlympians'' have this when the young girls swear their lives to the goddess, age can't kill them. Only if they fall in battle can they die.
* [[Literature/ThePictureOfDorianGray Dorian Gray]] from ''The Picture of Dorian Gray'' had this because his painting aged and took the physical effect of his sins instead of him, though NoImmortalInertia kicked in when his SoulJar was destroyed.
* In AndreNorton's ''Literature/DreadCompanion'', Kosgro observes that the people in this world do not die unless killed. Kilda contrasts this with very long-lived but still mortal aliens that she knows of.
* In the ''Literature/TheMortalInstruments'' and ''Literature/TheInfernalDevices'', warlocks are this. They do not age after reaching adulthood, but are not significantly more resistant to physical injury than humans. This is also implied to be the case with the Fair Folk. Vampires are a little closer to {{Immortality}}, as they possess HealingFactor, although they can still be killed, most obviously by sunlight.
* In MikhailAkhmanov and Christopher Nicholas Gilmore's ''Literature/CaptainFrenchOrTheQuestForParadise'', all of humanity has achieved this through a one-time medical treatment called Cellular Regeneration (or CR). Usually overlaps with ImmortalityBeginsAtTwenty, since most opt to have the procedure done in their early 20s in order to forever retain their youthful beauty (another procedure, Biosculpture, ensures that ''everyone'' is beautiful). A few choose to do it in their early 30s in order to look more professional. Only recently-colonized worlds without CR equipment still suffer from aging (all except the original colonists, of course), and criminals on many worlds can be sentenced to aging (i.e. the procedure is reversible). The titular protagonist is, likely, the only person in the galaxy who looks older, as he was born 20,000 years ago on Earth before CR was invented (his biological age is closer to 2000, thanks to TimeDilation). French was the test pilot of the first relativistic starship and became the first space trader when extrasolar colonies were established. The authors delve deep into the galaxy of ageless people, pointing out that most worlds have PopulationControl measures in place to avoid overpopulation from people not dying of natural causes (plenty of people still die for other reasons).
* In the ''Literature/ChroniclesOfThomasCovenant'', the Bloodguard do not age so long as they hold true to the Vow that they made to serve and guard the Lords of the Land. For reference, the Bloodguard was founded some 2000 years before the beginning of the story proper, and many of its charter members are still in service. The artificial beings created by the Demondim (such as the waynhim and the ur-viles) also do not die of natural causes. However, both Bloodguard and Demondim-spawn can be killed violently.
* In the semi-canonical sequels to Creator/HarryHarrison's ''Literature/{{Deathworld}}'' by Ant Akalandis, Jason discovers that his real parents (he was actually adopted) are this and, thus, he is as well. Additionally, Kerk becomes one after being injected with an ImmortalityInducer serum developed by a secret society. When being initiated into the organization, Kerk to finds out that his "grubber" counterpart Rhys has been a member (and immortal) for years.
* In Creator/SergeyLukyanenko's ''Literature/NightWatch'', the [[DifferentlyPoweredIndividual Others]] are pretty much this (or rather, they age extremely slowly), as long as they have access to Power. If their access is taken away, they become, effectively, human. Child Others continue to age normally until they are adults, at which point the process slows down to a crawl. It's a little different for witches, due to their CloserToEarth status. Outwardly, they use magic to maintain a youthful, [[VainSorceress beautiful]] appearance. Underneath, though, they eventually start looking like dried-up husks who would crumble to dust if their magic access is cut off.
[[/folder]]

[[folder:Live-Action TV]]
* ''Series/{{Lost}}'''s Richard Alpert made a deal with Jacob about 150 years ago, gaining immortality in exchange for becoming a leader to the people of the island. His reasons for asking this? [[spoiler: Being afraid of going to hell for accidental murder.]]
* Walter Jameson, from ''Series/TheTwilightZone'' episode "Long Live Walter Jameson", was granted this form of immortality in Ancient Greece by an alchemist. He says that he came close to death many times over the centuries due to injuries and disease, "but never close enough". [[spoiler: At the end of the episode when he is shot, he begins to age rapidly as he dies until he is nothing but a pile of dust.]]
* Former ''Series/DoctorWho'' companions Ian and Barbara Chesterton were stated in the show's spinoff ''Series/TheSarahJaneAdventures'' to have not aged between the 1960s and the 2010s.
** The Doctor zig-zags this as most of his incarnations never appear to age despite spending centuries in that particular body, with the Tenth Doctor claiming to Rose that part of the reason he lets go of his companions is because it pains him to see them age [[WhoWantsToLiveForever when he doesn't]]. The First and the Eleventh Doctor are the only numbered incarnations to have become elderly, the First being introduced as an old man and the Eleventh spending over 1200 years in that form before nearly dying of extreme old age.
* Downplayed in ''Series/{{Torchwood}}'' with Captain Jack Harkness. He initially thought he wouldn't age, but after a long time started to notice he was getting wrinkles and his hair was graying, so he was just ageing very slowly. As in "looks the same age after spending 2000 years buried alive" slowly.
* In the SpeculativeDocumentary ''[[http://curiosity.discovery.com/topic/neuroscience/can-you-live-forever-episode.htm Can You Live Forever?]]'', an experimental procedure allows Adam Savage-- [[CelebritySurvivor yes, the one from]] ''Series/MythBusters'' -- to retain a youthful constitution into old age.
-->I was 132 years old. I didn't feel it though. In, fact, I felt ''[[LivingForeverIsAwesome awesome]]''.
* ''Series/OnceUponATime'': Rumplestiltskin seems to have this, as he hasn't aged a day while Gepetto has aged from a young boy to an old man. It's generally a very bad idea to try and kill him by normal means.
* ''Series/SixHundredSixtySixParkAvenue'': Drake resident Danielle hasn't aged for at least sixty years as part of her deal with Gavin. However, she's unaware of it; it seems he regularly wipes her memory.
* John Amsterdam from ''Series/NewAmsterdam'' has physically been 35 years old since the 1600s. In the pilot he suddenly dies when it seems like he might have had an encounter with his true love, but he [[ResurrectiveImmortality resurrects]] and walks out of the morgue.
* The Immortals on ''Series/{{Highlander}}'' stop aging at the time they suffer their first death and become immortal.
* The [[NotUsingTheZWord Partially-Deceased Syndrome]] sufferers in ''Series/InTheFlesh'' are mentioned in Series 2 to have not aged a single day since [[ZombieApocalypse the Rising]]. One teenager derides his friends hopes for an undead-living relationship with his classmate as being impossible, since he'll still be 16 when she's 60.
* In ''Series/{{Haven}}'', mysterious human-like beings from another dimension like Mara, William, and Agent Howard have not visibly aged in centuries. However, it is pointed out that they can be wounded and die.
[[/folder]]

[[folder:Mythology, Legends, and Oral Tradition]]
* NorseMythology: The Ęsir and Vanir are immortal in this way, so long as they continue to eat the Apples of Idun.
* As above the huntresses of [[GreekMythology Artemis]] have this when the young girls swear their lives to the goddess, age can't kill them but they can be slain.
[[/folder]]

[[folder:Pinball]]
* ''VideoGame/GoldenLogres'' has the Fisher King, the King of Castle Carbonek who has been guarding the Holy Grail for centuries.
[[/folder]]

[[folder:Podcasts]]
* The ''Runepunk'' podcast series from Podcast/{{RPGMP3}} features a character called Kieron Hammerfall, an [[OurElvesAreBetter Andari]] [[InstantRunes Rune]][[SquishyWizard caster]]. Kieron is imbued with [[LinearWarriorsQuadraticWizards momentous arcane power]], as well as the [[GlassCannon durability of a dry twig]]. He's a member of the Andari race, which means he's [[TheAgeless blessed with immortality]] (barring any unfortunate accidents - which, considering his [[OneHitPointWonder virtually non-existent toughness]], could involve [[ScratchDamage being knocked over by a stiff breeze or something]]). Furthermore, [[WalkingTechbane Andari and technology don't mix]].
[[/folder]]

[[folder:Tabletop Games]]
* ''{{GURPS}}'' uses Unaging for immortality. This means ''only'' that the character will never grow older or die of old age it confers no resistance to disease or harm. Other forms of immortality require additional powers.
* In ''TabletopGame/{{Warhammer 40000}}'', surprisingly, plays this trope pretty extensively. The common [[PunyEarthlings humans]] and the Tau are the only ones that don't have [[FountainOfYouth a means to keep young]].
** Vanilla humans have access to juvenat treatments which can keep them young indefinitely, and can even treat people to keep them juvenated at a particular age within the span of adulthood, and some senior authority figures prefer to keep an outward appearance to give an impression of wisdom and experience. Thing is, juvenats are quite expensive, so only members of wealthy noble houses, highly valued or highly placed civil servants, and Inquisitorial personnel have easy access to them.
*** Techpriests of the [[AveMachina Adeptus Mechanicus]] replace all of their fleshy bits with machine parts over time, not to mention that they have access to the Imperium's limited cloning technologies. Provided they don't get killed, they're on record for living for ''millennia''.
*** The Space Marines are somewhat different in that their [[SuperSoldier Astartes physiology]] will keep them somewhere between young and middle age, in theory, forever. In practice, their bodies take strains and wounds that even their bodies can't keep up with indefinitely, and they do age, albeit very slowly. Except for some of the most senior members of a chapter, their age is more told not by wrinkles and lines, but by scars and bionics they accrue over the years.
** [[SpaceElves Eldar]] will live a natural lifespan of roughly 1000 years. However, they will live longer as they get stronger psychic potential. As [[WitchSpecies each of them is a natural latent psyker]], they simply need training to expand and refine their psychic powers, and extend their life cycle. The most famous/notorious Eldar Farseer, Eldrad Ulthran, has been alive (and apparently young) since the Horus Heresy, ''nearly 11,000 years ago'', and there's no telling how long he was alive before then.
*** Dark Eldar are [[ImmortalityImmorality notorious]] for their means of keeping them alive. They have to go on [[MadeASlave slave raids to abduct prisoners]], [[ColdBloodedTorture torture them to death]], and [[LifeDrinker drink in their suffering and their souls]] to rejuvenate themselves to youth. There are also a number of other, more creative ways of [[FateWorseThanDeath keeping a prisoner alive]] to extend their suffering.
** [[OurOrksAreDifferent Ork]]s are like lobsters, in that they never grow old, they just keep growing up and keep getting meaner. Theoretically, they could live like that forever. However, since they're constantly fighting, even when they come in the hundreds of thousands, Orks rarely ever [[AMillionIsAStatistic get past thirty, if that]].
*** Orks also never stop growing, meaning the oldest ones are extremely huge (the youngest usually being about six or seven feet tall). The fan-made character Deffboss, the only known survivor of the original batch of Orks created by the Old Ones, has been around since the dinosaurs died out and [[GeniusLoci is the size of a planet]].
* In both ''TabletopGame/{{Earthdawn}}'' and ''TabletopGame/{{Shadowrun}}'', dragons and Immortal Elves have this quality. Dunkelzahn was apparently tens of thousands of years old, and some immortal elves were thousands of years old in ''TabletopGame/{{Shadowrun}}''.
* "Longevity: Immortal" is an option for the Life Support power in ''{{Champions}}''
* Likewise, in ''MutantsAndMasterminds'', Immunity (aging) is just a 1 point power. If you want true immortality, you need to buy into ranks of Regeneration to account for things like rising from the dead.
* ''DungeonsAndDragons'' has two variants on this trope: Monks and Druids gain the Timeless Body ability, which causes them to no longer age physically (or at least do not get any penalties for aging) until they drop dead when they reach their species' maximum age (thus invoking the OldMaster trope). Two races, [[{{Transhuman}} Elan]] and the [[NatureSpirit Killoren]], have no maximum age and will visibly age to a certain point (venerable age for Elan, old age for Killoren) but never die of old age. Combining either race with either class leads to this trope. There's also an epic feat that adds half your maximum possible age to each age category (a stadium where your character gets visibly older), which has the same effect on them.
[[/folder]]

[[folder:Video Games]]
* [[CommandAndConquerTiberium KANE]] [[JokerImmunity LIVES IN DEATH!]]
* The angels from ''VideoGame/TalesOfSymphonia''. The Cruxis Crystals halts the aging process, which is why [[spoiler: Mithos Yggdrasil]] still looks more or less exactly the way he did [[spoiler: 4000 years ago.]] Even Expheres slow the aging process considerably, in addition to the basic skill upgrades they give. Presea even brings up the possibility of a world of exosphere-preserved Immortals to Lloyd, who gently reminds her that they're [[spoiler: PoweredByAForsakenChild.]]
* In ''[[FinalFantasyVII On the Way to a Smile]]'', the short story "Case of Nanaki" reveals that Vincent Valentine was made biologically immortal by Hojo's experiments. As a result, he'll live at least as long as [[LongLived Nanaki]]. However, given the events and nature of Dirge of Cerberus, it's safe to assume he can still be killed.
* ''{{Warcraft}}'':
** [[OurElvesAreBetter Night elves]] used to have this form of immortality, before sacrificing it to save the world from [[LegionsOfHell the Burning Legion]]. [[ProudScholarRace Draenei]] may also have this form of immortality (Velen is explicitly stated to), or they may just be extremely long lived. [[OurDemonsAreDifferent Demons]] also have this type of Immortality (at least one quest states that at least some of them have Type IV as well).
** [[OurDragonsAreDifferent Dragons]], or at least the Aspects, seem to be undying as well. [[spoiler:Or were until they recently had to relinquish it, anyway.]]
* The 27 True Runes of ''{{Suikoden}}'' grant this type of immortality, in addition to various abilities based on the aspect of existence that the True Rune governs (for instance, instant death attacks for the Rune of Life and Death AKA Soul Eater, or powerful destructive attacks that also hurt the user for the Rune of Punishment).
* ''Franchise/TheElderScrolls'':
** The Nerevarine of ''[[VideoGame/TheElderScrollsIIIMorrowind Morrowind]]'' becomes this, as a consequence of [[spoiler: having Corprus but getting negative effects cured]]. If brought to sufficient heights of power, they can also gain enough regenerative power to leave this trope and [[FromASingleCell enter another]].
** Dragons in ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]'' are this, being quasi-angelic entities who can never truly die unless their soul is absorbed by another dragon or [[TheChosenOne a Dragonborn]]. [[spoiler:Paarthurnax]] in particular has been waiting on top of the Throat of the World for Alduin's return since the Dragon War many thousands of years ago. The most powerful weapon that can be used against them is a Thu'um [[spoiler:that forces dragons to briefly know what it's like to be Mortal, Finite, and Temporary. In gameplay it robs them of the powers unique to dragonkind: flight and the Thu'um.]]
* Being a ''MortalKombat'' champion grants this type of immortality until the next Mortal Kombat tournament, which is usually a generation away from the previous one.
* As the UltimateLifeForm, [[Franchise/SonicTheHedgehog Shadow the Hedgehog]] is ageless, most likely due to the genetic material contributed to Project Shadow by his biological "father," [[spoiler:[[VideoGame/ShadowTheHedgehog Black Doom]]]]. The reason behind this was that Shadow's creator, Professor Gerald Robotnik, wanted to study immortality and use the fruits of his research to find a cure for his granddaughter (and Shadow's surrogate sister) Maria, as she was terminally ill and suffering from a fatal disease known as NIDS (Neuro-Immuno Deficiency Syndrome).
* The Dragons in ''VideoGame/TheLegendOfZeldaSkywardSword'' are implied to be this way. You find the Thunder Dragon's remains in the present, and travel back in time to find out he's sick and dying. After healing him in the past, he's simply absent in the present, but does show up for the song, so he likely just changed residence instead of dying.
* ''VideoGame/DarkSouls'' has multiple types of beings that are TheAgeless. The Everlasting Dragons, the Lords and the Gods, and undead that can maintain their humanity.
* [[AssPull About 95% of the returning characters]] are this in ''[[VideoGame/SoulSeries Soulcalibur V]]'', despite the fact that ''SCV'' makes a TimeSkip of '''''seventeen years'''''. The only characters who have aged physically are Siegfried, Mitsurugi and Hilde (40, 46 and 35 respectively). The rest got some convoluted excuse for why they look exactly the same as they did seventeen years ago.
* Fujiwara no Mokou and Kaguya Houraisan in ''VideoGame/{{Touhou}}'' are described as being "eternal", completely untouched by the flow of time. As well as being perpetually young, it comes with the added caveat they simply can't die: being eternally unchanging means they rapidly regenerate from anything, even clearly fatal wounds. Needless to say, the violent CycleOfRevenge between the two has been going on for quite a while with no significant progress, despite constant "successful" assassinations from both sides.
* Ghouls and Super Mutants in the ''VideoGame/{{Fallout}}'' series. The former can still suffer from mental degeneration, which results in them becoming [[OurZombiesAreDifferent zombie-like]] "feral" ghouls.
* As revealed in ''VideoGame/HyperdimensionNeptuniaV'', any CPU can get killed through any means, however they won't ever age at all.
* In ''VideoGame/SwordOfTheStars'', the Liir cannot die of old age. Instead, they become bigger and more powerful. Their population is kept in check by the SquareCubeLaw; eventually, their mass becomes too great for them to survive even in an aquatic environment and they are crushed to death by gravity. [[spoiler:The Suul'ka are Liir elders who went "screw gravity" and teleported themselves into space.]]
* The krogan in ''Franchise/MassEffect'' are implied to be this. Wrex and Okeer are both over a thousand years old (Wrex was born sometime after the start of the Krogan Rebellions, while Okeer was apparently alive and fighting during the Rachni Wars), and neither show even the slightest sign of keeling over from old age any time soon. The only reason that most krogan rarely do reach advanced age is because their homeworld Tuchanka is a DeathWorld, populated by Thresher Maws and fierce infighting between the various clans. The life expectancy for krogan who go off-world is just as low, due to many hiring themselves out as mercenaries or joining criminal gangs.
[[/folder]]

[[folder:Visual Novels]]
* In ''UminekoNoNakuKoroNi'', [[spoiler:Ikuko Hachijō]] is implied to be this and is a bit of an enigma in the series in that regard. In the epilogue, which takes place in the 2030s, she must be easily 70 years old but is every bit as youthful as when [[spoiler:she had found Battler/Tooya]], which was in ''1986''. [[spoiler:Ange]] even points it out, saying that "rather than being good with make-up, she had a mystique around her, as if she was an immortal who didn't age".
[[/folder]]

[[folder:Webcomics]]
* The fae races of ''{{Drowtales}},'' (drow, light elves, faeries) provided they live with enough other fae to generate a surplus of mana. Otherwise they will suffer from mana deprivation and will start to age much like humans do. One audiobook explains that fae do in fact have a finite natural lifespan (implied to be somewhere around 1000 or upwards), but most don't live long enough to ever get close to it, making them effectively this trope to any humans they might run across. [[http://www.drowtales.com/mainarchive.php?sid=7606 It's explained by Quain'tana]] that the older you get, the more mana you need to sustain your body - thus the very old become increasingly stuck living in cities. Diva'Ratrika, the Imperial Queen was most likely aged in the 4 digits and was essentially stuck in her fortress.
* In ''AMagicalRoommate,'' Oracles live for as long as they want. They can be killed by outside forces, but otherwise, they will live until they decide to die - unlike their counterparts, Sages, who do die of old age.
* Im ''{{Sinfest}}'', [[http://www.sinfest.net/archive_page.php?comicID=2888 Monique craves this.]]
[[/folder]]

[[folder:Web original]]
* In Aelan mythology from WebOriginal/UstalNaror islands, ancients, kyrgancients, and many more are ageless. But no one of them will live as long as the oldest stone.
[[/folder]]

[[folder:Western Animation]]
* In ''WesternAnimation/JackieChanAdventures'' anyone with the Dog Talisman is immortal.
* Most incarnations of the ''{{Transformers}}''. [[MadeOfIron And good luck with the fatal damage.]]
** Technically Transformers DO age. There are a few bots that are notably elderly looking and not quite as swift as the other bots such as Kup, Alpha Trion, and Sentinel Prime. We've never actually had someone ''confirmed'' as dying of old age, but it's suggested by the characters of ancient backstories ''mostly'' being no longer around (In G1, Alpha Trion's the only character ''known'' to have been in the Quintesson wars, and in ''WesternAnimation/BeastWars,'' too much of G1 is forgotten/sketchy for most of its players to still be around, though Ravage still is.) However a Transfomer's life span is insanely long, lasting eons. Optimus Prime is at least several miliennia old, and is generally depicted as the equivalent of a human's late 30s.
*** As old age is rarely a concern in an action-oriented series, it hasn't been addressed whether aging can be avoided through proper maintenance, or how a full-body rebuild/transplant would affect it. Additionally, by the time a transformer is old enough to be considered old by their standards, they're a full-blown TimeAbyss, leaving the implication that transformer aging is more mental than physical. Most notably: In ''BeastWars,'' the Decepticon Ravage has been rebuilt into a Predacon. He shows ''no'' sign of the "old bot" portrayal even though the events of Generation 1 are ancient history to the point of much being sketchy. Also, the movie ''Revenge of the Fallen'' gives us Jetfire: we finally get an explanation for how robots can appear to age like humans. He was stranded on Earth with no Energon, and has been in stasis lock for a very, very long time. Apparently, it's Energon depletion, not time, that makes a robot "old" in appearance and any creaky joints and such are due to not getting proper maintenance. As always, what happens in one continuity needn't go for all, but it ''does'' make sense of the fact that in every series, for every bot portrayed as "old" there are others from the same era who are not.
* WesternAnimation/AdventureTime: Princess Bubblegum seems to be this. While she usually appears about 18, this "age" (and the maturity that comes with it) seems to really depend on her physical size.
** Marceline is immortal, and seems to have been a teenager for about a thousand years.
** Ice King from the same show qualifies; the crown made him look like an old man when he was quite young, and when the power of the crown was taken away, a thousand years later, he reverted to his previous age as Simon Petrikov [[NoImmortalInertia then rapidly started dying of old age]]. He took care of Marceline when she was a child, and according to Death himself, may well live to see the Sun blow up.
* In ''WesternAnimation/StevenUniverse'', the Crystal Gems don't age, though they can still die in other ways. [[HalfHumanHybrid Steven]] has grown like a regular human so far, but it's not clear if ImmortalityBeginsAtTwenty for him or the other gems or if he'll continue aging past adulthood. It is shown that his state of mind affects his physical age, to the point where he can accidentally cause himself to die of old age.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'': Equestria's [[WingedUnicorn Alicorn]] [[PhysicalGod God]]-[[PrincessesRule Princesses]] appear to be this, if not [[CompleteImmortality completely immortal]], being [[ReallySevenHundredYearsOld well over a thousand years old]]. According to Luna in ''Literature/TheJournalOfTheTwoSisters'', the sisters are just ''very'' LongLived. Starswirl the Bearded on the other hand was this thanks to an age reversal spell he created and used on himself.
* It's unknown if imaginary friends in ''WesternAnimation/FostersHomeForImaginaryFriends'' can suffer health problems or die from old age, but time never changes their appearance. A photo album showed the main imaginary cast looked identical at least twenty years ago, which made Herriman question the point of taking pictures in the first place.
[[/folder]]

[[folder:Real Life]]
* This occurs in RealLife among several different species. Biologists know this phenomenon as [[https://en.wikipedia.org/wiki/Biological_immortality biological immortality]] and [[https://en.wikipedia.org/wiki/Negligible_senescence negligible senescence]]. Jellyfish are the most well known example. ''Website/{{Cracked}}'''s [[http://www.cracked.com/article_20055_6-unassuming-animals-that-are-secretly-immortal.html 6 Unassuming Animals That Are Secretly Immortal]] lists others, such as lobsters and turtles. Their populations are kept in check anyway since nature offers plenty of ways to die outside of old age.
* Scientists in RealLife have been attempting this type for a very, long, time, the most recent and well-known being Aubrey de Grey. Many believe that humans will eventually attain it. There are a substantial number of people who believe that the first bicentenarian-to-be has already been born, and is possibly, like in the ''Curiosity'' example above, already an adult. Whether this is actually a realistic prognostication or just an expression of the current generation's desire to evade death is of course impossible to tell until after the fact.
[[/folder]]

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