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'Cause Lan isn't half god. He's a quarter. His mom was a demigod.


* In ''Webcomic/PublicHumiliation'' pookas mature in about a year, their lifespan is never given specific numbers but it was short enough for Boo to break up with her longer-lived boyfriend for fear of leaving him when he still had his life ahead of him. [[spoiler: However, it's discovered that [[DivineLineage demigods]] like Lan's progeny, including Boo, have the proportional equivalent to ImmortalityBeginsAtTwenty, and they can pass that longevity onto their mates.]]

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* In ''Webcomic/PublicHumiliation'' pookas mature in about a year, their lifespan is never given specific numbers but it was short enough for Boo to break up with her longer-lived boyfriend for fear of leaving him when he still had his life ahead of him. [[spoiler: However, it's discovered that [[DivineLineage demigods]] semigods]] like Lan's progeny, including Boo, have the proportional equivalent to ImmortalityBeginsAtTwenty, and they can pass that longevity onto their mates.]]
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This trope will often overlap with WeAreAsMayflies and may result in {{Mayfly December Romance}}s. Compare ImmortalImmaturity, when a character who is immortal acts immature and childish in contrast to their age.

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This trope will often overlap with WeAreAsMayflies and may result in {{Mayfly December Romance}}s. Compare ImmortalImmaturity, when a character who is immortal acts immature and childish in contrast to their age.
age; AgeWithoutYouth, when a character has an extended or infinite lifespan but still grows old; and NotGrowingUpSucks, when a character is stuck in the childhood/adolescence stage and suffers in the process.
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Note that in real life, most animals grow to maturity as fast as physically possible and then live a maximum lifespan roughly proportional to their likelihood of being eaten. I.e. bats mature in one year and live up to 20 because they fly, deer mature in 18 months and live about ten years, blue whales mature about as fast as humans and may live for centuries...

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Note that in real life, most animals grow to maturity as fast as physically possible and then live a maximum lifespan roughly proportional to their likelihood of being eaten. I.e. bats mature in one year and live up to 20 because they fly, deer mature in 18 months and live about ten years, blue whales mature about as fast as humans and may live for centuries...
centuries. That being said, it has been observed that the trope is generally TruthInTelevision, though the reality is that it's more of a case of correlating both maturation rate and maximum lifespan with [[https://en.wikipedia.org/wiki/R/K_selection_theory reproductive quantity vs. quality]] rather than with each other; that is, the fewer the number of offpsring produced at a time, the slower they mature and the longer their lifespan, whereas [[ExplosiveBreeder rapid breeders]] tend to have both faster maturation rates and shorter lifespans. Outliers exist, of course, making the trope more of a helpful guideline than an absolute rule.


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* Subverted with Abh in ''LightNovel/CrestOfTheStars'' and its sequels and adaptations. Genetic Abh live to about 250 years until the TheFogOfAges starts to set in, but they generally age exactly as normal people do, they just ''stop'' doing so somewhere in the range of 20-25 biological years, and remain physically young and sprightly until the death.
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* Subverted with Abh in ''LightNovel/CrestOfTheStars'' and its sequels and adaptations. Genetic Abh live to about 250 years until the FogOfAges starts to set in, but they generally age exactly as normal people do, they just ''stop'' doing so somewhere in the range of 20-25 biological years, and remain physically young and sprightly until the death.

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* Subverted with Abh in ''LightNovel/CrestOfTheStars'' and its sequels and adaptations. Genetic Abh live to about 250 years until the FogOfAges TheFogOfAges starts to set in, but they generally age exactly as normal people do, they just ''stop'' doing so somewhere in the range of 20-25 biological years, and remain physically young and sprightly until the death.
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* Windermerans in ''Anime/MacrossDelta'' are a subspecies of humanity created by the [[ThePrecursors Protoculture]] to have incredible physical abilities [[CastFromLifespan at the cost of a radically shortened lifespan]]. The average Windermeran lives for barely 30-35 years. It's played with in that [[ValuesDissonance it mainly concerns their]] ''[[ValuesDissonance social]]'' [[ValuesDissonance age]], rather than biological. Frejya, for example, is fourteen, and looks it, but is considered an old maid and enters the story to escape an ArrangedMarriage with a potential suitor who, she believes, she is BetterAsFriends with. Helman is already an old man by their standards at 33, with confirmed grandchildren, but he doesn't ''look'' any older than that.

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* Windermerans in ''Anime/MacrossDelta'' are a subspecies of humanity created by the [[ThePrecursors Protoculture]] to have incredible physical abilities [[CastFromLifespan at the cost of a radically shortened lifespan]]. The average Windermeran lives for barely 30-35 years. It's played with in that [[ValuesDissonance [[DeliberateValuesDissonance it mainly concerns their]] ''[[ValuesDissonance ''[[DeliberateValuesDissonance social]]'' [[ValuesDissonance [[DeliberateValuesDissonance age]], rather than biological. Frejya, for example, is fourteen, and looks it, but is considered an old maid and enters the story to escape an ArrangedMarriage with a potential suitor who, she believes, she is BetterAsFriends with. Helman is already an old man by their standards at 33, with confirmed grandchildren, but he doesn't ''look'' any older than that.
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* In ''Literature/LabyrinthsOfEcho'' the inhabitants of the titular city normally live to at least about 300, and can potentially live for thousands, depending on the personal magical power,[[note]][[MentorArchetype Juffin]], for example, is about 800, and [[ProHumanTranshuman has left his humanity so far behind]] that the very concept of death is entirely alien to him.[[/note]] and they age accordingly, so [[TheProtagonist Max]], who is from our world, and is in his mid-thirties, was initially warned not to tell everyone his real age, lest he was tought of as a ''toddler''. His friend Melifaro is his rough age-mate in all appearances, but is of ~130 years of age locally.
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* Played straight with Kanna (and presumably all dragons) in ''Manga/MissKobayashisDragonMaid''. Despite being Really700YearsOld, she looks and acts like a child because biologically and psychologically she is one, even if she's chronologically very old. This has significantly contributed to the "Don't Lewd the Dragon Loli" meme that has grown up around the anime adaptation of the comic.
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Some grammar cleanup.


* Windermerans in ''Anime/MacrossDelta'' is a subspecies of humanity created by the [[ThePrecursors Protoculture]] to have the incredible physical abilities [[CastFromLifespan at the cost of radically shortened lifespan]]. The average Windermeran lives barely for 30-35 years. It's subverted, though, in that [[ValuesDissonance it mainly concerns their]] ''[[ValuesDissonance social]]'' [[ValuesDissonance age]] rather than biological — Frejya, for example, is 14 and looks so, but is considered an old maid, and actually enters the story to escape the ArrangedMarriage with a potential suitor who, she believes, is BetterAsFriends. Helman is already an old man at 33 by their standards, with confirmed grandchildren, but he doesn't ''look'' any older than that.

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* Windermerans in ''Anime/MacrossDelta'' is are a subspecies of humanity created by the [[ThePrecursors Protoculture]] to have the incredible physical abilities [[CastFromLifespan at the cost of a radically shortened lifespan]]. The average Windermeran lives for barely for 30-35 years. It's subverted, though, played with in that [[ValuesDissonance it mainly concerns their]] ''[[ValuesDissonance social]]'' [[ValuesDissonance age]] age]], rather than biological — biological. Frejya, for example, is 14 fourteen, and looks so, it, but is considered an old maid, maid and actually enters the story to escape the an ArrangedMarriage with a potential suitor who, she believes, she is BetterAsFriends. BetterAsFriends with. Helman is already an old man at 33 by their standards, standards at 33, with confirmed grandchildren, but he doesn't ''look'' any older than that.
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* Windermerans in ''Anime/MacrossDelta'' is a subspecies of humanity created by the [[ThePrecursors Protoculture]] to have the incredible physical abilities [[CastFromLifespan at the cost of radically shortened lifespan]]. The average Windermeran lives barely for 30-35 years. It's subverted, though, in that [[ValuesDissonance it mainly concerns their]] ''[[ValuesDissonance social]]'' [[ValuesDissonance age]] rather than biological — Frejya, for example, is 14 and looks so, but is considered an old maid, and actually enters the story to escape the ArangedMarriage with a potential suitor who, she believes, is BetterAsFriends. Helman is already an old man at 33 by their standards, with confirmed grandchildren, but he doesn't ''look'' any older than that.

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* Windermerans in ''Anime/MacrossDelta'' is a subspecies of humanity created by the [[ThePrecursors Protoculture]] to have the incredible physical abilities [[CastFromLifespan at the cost of radically shortened lifespan]]. The average Windermeran lives barely for 30-35 years. It's subverted, though, in that [[ValuesDissonance it mainly concerns their]] ''[[ValuesDissonance social]]'' [[ValuesDissonance age]] rather than biological — Frejya, for example, is 14 and looks so, but is considered an old maid, and actually enters the story to escape the ArangedMarriage ArrangedMarriage with a potential suitor who, she believes, is BetterAsFriends. Helman is already an old man at 33 by their standards, with confirmed grandchildren, but he doesn't ''look'' any older than that.
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[[folder:Anime and Manga]]
* Windermerans in ''Anime/MacrossDelta'' is a subspecies of humanity created by the [[ThePrecursors Protoculture]] to have the incredible physical abilities [[CastFromLifespan at the cost of radically shortened lifespan]]. The average Windermeran lives barely for 30-35 years. It's subverted, though, in that [[ValuesDissonance it mainly concerns their]] ''[[ValuesDissonance social]]'' [[ValuesDissonance age]] rather than biological — Frejya, for example, is 14 and looks so, but is considered an old maid, and actually enters the story to escape the ArangedMarriage with a potential suitor who, she believes, is BetterAsFriends. Helman is already an old man at 33 by their standards, with confirmed grandchildren, but he doesn't ''look'' any older than that.
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Note that in real life, most animals grow to maturity as fast as physically possible and then live a maximum lifespan roughly proportional to their likelihood of being eaten. I.e. bats mature in one year and live up to 20 because they fly, deer mature in 18 months and live about ten years, blue whales mature about as fast as humans and may live for centuries...


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[[/folder]]

[[folder: Real Life]]
* Some other great apes have life cycles proportionally similar to humans, but shorter lifespans.
** Gorillas often reach maturity at 9-12 and typically live to 40 in the wild, 50 in captivity, with 60 as the record.
** Chimpanzees are mature at about 10 and have reached their 60s in captivity, with at least one specimen who lived to 78.
** Orangutans are sexually mature at 15, there's little data on their potential longevity but one has been recorded living to 55.
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* In ''Webcomic/PublicHumiliation'' pookas mature in about a year, their lifespan is never given specific numbers but it was short enough for Boo to break up with her longer-lived boyfriend for fear of leaving him when he still had his life ahead of him. [[spoiler: However, it's discovered that [[DivineLineage demigods]] like Lan's progeny, including Boo, have the proportional equivalent to ImmortalityStartsAtTwenty, and they can pass that longevity onto their mates.]]

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* In ''Webcomic/PublicHumiliation'' pookas mature in about a year, their lifespan is never given specific numbers but it was short enough for Boo to break up with her longer-lived boyfriend for fear of leaving him when he still had his life ahead of him. [[spoiler: However, it's discovered that [[DivineLineage demigods]] like Lan's progeny, including Boo, have the proportional equivalent to ImmortalityStartsAtTwenty, ImmortalityBeginsAtTwenty, and they can pass that longevity onto their mates.]]
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* In ''Webcomic/PublicHumiliation'' pookas mature in about a year, their lifespan is never given specific numbers but it was short enough for Boo to break up with her longer-lived boyfriend for fear of leaving him when he still had his life ahead of him. [[spoiler: However, it's discovered that [[DivineLineage demigods]] like Lan's progeny, including Boo, have the proportional equivalent to ImmortalityStartsAtTwenty, and they can pass that longevity onto their mates.]]
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** In the first book the titular character is over forty in Terran years, but being a third-generation Prolong recipient she appears to be in her early twenties and in some aspects displays the emotional maturity of a teenager.
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** {{Space Marine}}s age very, very slowly, since the process that turns them into superhumans begins around adolescence and takes years to complete. For example, [[http://spacemarine.wikia.com/wiki/Leandros these]] [[http://spacemarine.wikia.com/wiki/Titus three]][[http://spacemarine.wikia.com/wiki/Sidonus Astartes]] are 75, 175 and 250 years old respectively. However, it''s usually harder to tell, since liberal use of BaldOfAwesome hides the age difference.

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** {{Space Marine}}s age very, very slowly, since the process that turns them into superhumans begins around adolescence and takes years to complete. For example, [[http://spacemarine.wikia.com/wiki/Leandros these]] [[http://spacemarine.wikia.com/wiki/Titus three]][[http://spacemarine.wikia.com/wiki/Sidonus Astartes]] Astartes]][[note]]Note the two service studs in his temple. Each is given for a full century spent on the battlefield.[[/note]] are 75, 175 and 250 years old respectively. However, it''s it's usually harder to tell, since liberal use of BaldOfAwesome hides the age difference.

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* Elves in ''Manga/{{Drifters}}'' are stated to have a lifespan about five or six times that of humans, and it shows in their rate of maturation. The youngest elves shown are young boys who, when asked, reveal their ages as thirty-six and thirty-nine. This shocks Toyohisa, since this means they're older than he is.

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* Elves in ''Manga/{{Drifters}}'' are stated to have a lifespan about five or six times that of humans, and it shows in their rate of maturation. The youngest elves shown are young boys who, when asked, reveal their ages as thirty-six and thirty-nine. This shocks Toyohisa, since this means they're older than he is.is — the RealLife Toyohisa Shimazu died in the Battle of Sekigahara being all of thirty years old (though in manga he often acts younger than his age would suggest).
* Subverted with Abh in ''LightNovel/CrestOfTheStars'' and its sequels and adaptations. Genetic Abh live to about 250 years until the FogOfAges starts to set in, but they generally age exactly as normal people do, they just ''stop'' doing so somewhere in the range of 20-25 biological years, and remain physically young and sprightly until the death.
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** 120 is already an exceptional age for a hobbit, most of who easily pass the 90-mark, but rarely reach one hundred. It's not that the hobbits live much longer than humans, they just view age differently, considering life to really start at 40, when all the frivolities of youth are behind.
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* While the total lifespan of the titular''WeseternAnimation/{{Gargoyles}}'' is not stated, in the Season 2 episode "Grief" Goliath explains that Gargoyles age at half the rate of humans. This can be seen when Goliath and Eliza meet Tom. Tom was a child back in the Manhattan Clan's original time and helped care for the unhatched Gargoyle eggs in the castle rookery. When they meet Tom as an adult, he's old enough to have significant amounts of gray in his hair, but the Gargoyles he helped nurture are still adolescents.

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* While the total lifespan of the titular''WeseternAnimation/{{Gargoyles}}'' titular ''WeseternAnimation/{{Gargoyles}}'' is not stated, in the Season 2 episode "Grief" Goliath explains that Gargoyles age at half the rate of humans. This can be seen when Goliath and Eliza meet Tom. Tom was a child back in the Manhattan Clan's original time and helped care for the unhatched Gargoyle eggs in the castle rookery. When they meet Tom as an adult, he's old enough to have significant amounts of gray in his hair, but the Gargoyles he helped nurture are still adolescents.
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[[folder:Tabletop Games]]
* In ''TabletopGame/DungeonsAndDragons'' half-orcs reach adulthood at 14 and are considered venerable at 60 with a max age of 80, humans are adults at 15 and venerable at 70 with a max lifespan of 110. Full orcs presumably have it even worse.
* In ''TabletopGame/{{Shadowrun}}'' all metahumans are legally considered adults at 18, but orks are physically mature at 12 and live 35-40 years.


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* Winston, ''VideoGame/{{Overwatch}}'s'' resident [[UpliftedAnimal uplifted]] gorilla is 29 years old but comes across as middle aged, IRL gorillas live about 50 years.

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* In ''Series/DoctorWho'', a Time Lord's rate of aging relative to their total lifespan is near impossible to determine, since when their bodies are burned out they [[BizarreAlienBiology rewrite their entire genetic codes]] and [[TheNthDoctor regenerate into a new body with new personality traits]]. Their aging within a single regeneration is clearer. We have seen the First, War, and Eleventh Doctors in old age, with either the statement or implication it took centuries to reach that point. The length of a Time Lord's childhood is unknown, but it's been offhandedly mentioned that Time Lords are still considered "kids" into their one hundreds.

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* In ''Series/DoctorWho'', a ''Series/DoctorWho:''
** A
Time Lord's rate of aging relative to their total lifespan is near impossible to determine, since when their bodies are burned out they [[BizarreAlienBiology rewrite their entire genetic codes]] and [[TheNthDoctor regenerate into a new body with new personality traits]]. Their aging within a single regeneration is clearer. We have seen the First, War, and Eleventh Doctors in old age, with either the statement or implication it took centuries to reach that point. The length of a Time Lord's childhood is unknown, but it's been offhandedly mentioned that Time Lords are still considered "kids" into their one hundreds.
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* In one ''Literature/TheHistoryOfTheGalaxy'' novel, a LostColony turns out to be the site of an abandoned alien bio-lab. The colonists became exposed to a virus that mutated them into various forms: some gained {{invisibility}} and [[TheEmpath empathy]] (Shadows), others became [[VoluntaryShapeshifting shapeshifters]] (Metamorphs), yet others gained PsychicPowers (Emglans), and the fourth category didn't get any powers (Chosen). However, all four groups became TheAgeless. Children age normally until maturity, at which point the aging process stops. ImmortalProcreationClause is in effect as well, as it's extremely rare for new children to be born. Despite the fact that, at about 20, the colonists are physically and mentally adults, the centuries of isolation have resulted in the colonists adopting this trope. Someone who is ''merely'' 150 years old is treated as a child. When a man from TheFederation crash-lands on the planet, he is treated as an ''infant'' because he's in his 30s, despite the fact that he's a trained soldier and has more combat experience than all of the colonists put together.


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** In some fan multi-Doctor works, later Doctors consider the First and Second to be mere children, despite the fact that the First doctor is physically older than them.
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* In the ''Series/{{Blade}}'' TV series, pureblood vampires age extremely slowly. The most oft-seen pureblood Charlotte is about 200 years old but looks like a girl barely in her teens. Her outfit is decidedly Puritanical. However, her mindset is definitely not childlike, and everyone treats her with the kind of respect reserved for elders. The other purebloods also treat her as equals, aware of her actual age. Overlord Rusk, looking like a man in his late 30s or 40s, is stated to be over 600. It's unclear if they actually stop aging at some point. After all, turned vampires stop aging the moment they become undead.
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* Elves in ''Webcomic/TheOrderOfTheStick'' are shown to experience this. Vaarsuvius' [[http://www.giantitp.com/comics/oots0629.html two children are 26 years old]]. For elves, this is the equivalent of kindergarten-age.

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* Elves in ''Webcomic/TheOrderOfTheStick'' are shown to experience this. Vaarsuvius' [[http://www.giantitp.com/comics/oots0629.html two children are 26 years old]]. For elves, this is the equivalent of kindergarten-age. In the prequel ''On the Origins of [=PCs=]'', V mentions spending 20 years in diapers as a downside to slower aging.

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Removing a context line from Gargoyles and commenting out the Disgaea entry since it states slower aging but no indication of how it's proprtionate to lifespan


* In ''VideoGame/Disgaea'' Demons and Angels seem to age 10 times slower than humans

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* %% In ''VideoGame/Disgaea'' ''VideoGame/{{Disgaea}}'' Demons and Angels seem to age 10 times slower than humans



''(Needs more context, how long do Gargoyles live normally?)''
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* In ''Film/MagicalLegendOfTheLeprechauns'' Mikey looks to be in his early twenties, but is stated to be "not even two hundred years old yet." Combined with the knowledge that leprechauns live for a thousand years at minimum and we see people who look young, middle-aged, or old, ProportionalAging is in effect.

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* In ''Film/MagicalLegendOfTheLeprechauns'' Mikey looks to be in his early twenties, but is stated to be "not even two hundred years old yet." Combined with the knowledge that We see leprechauns live for and fairies at all stages of life along with different people declaring themselves to be over a thousand years at minimum and we see people who look young, middle-aged, or old, ProportionalAging is in effect.old.

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[[folder: Comic Books]]
* In ''Film/MagicalLegendOfTheLeprechauns'' Mikey looks to be in his early twenties, but is stated to be "not even two hundred years old yet." Combined with the knowledge that leprechauns live for a thousand years at minimum, proportional aging seems to be in effect. ''(Needs more context as to whether this is Proportional Aging or ImmortalityBeginsAtTwenty)''
[[/folder]]


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* In ''Film/MagicalLegendOfTheLeprechauns'' Mikey looks to be in his early twenties, but is stated to be "not even two hundred years old yet." Combined with the knowledge that leprechauns live for a thousand years at minimum and we see people who look young, middle-aged, or old, ProportionalAging is in effect.
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I've realized I've only paid sporadic attention to my last few YKTTW's. That in mind, rather than let them sit I'm making them officially Administrivia/UpForGrabs (though given how long some of them sat they probably already were...)
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Created from YKTTW

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I've realized I've only paid sporadic attention to my last few YKTTW's. That in mind, rather than let them sit I'm making them officially Administrivia/UpForGrabs (though given how long some of them sat they probably already were...)
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Sometimes, when we see a race that is either immortal or very long-lived, it seems as if they age normally until approximately adolescence or early adulthood, and then stop completely. It is from this that we get the trope ImmortalityBeginsAtTwenty.

This trope is essentially the inversion, centering around a long-lived race with a proportionally long life cycle. A simple example would be to say that if this race lived twice as long as a human, then their childhood, adolescence, etc would also be about twice as long.

In the same vein, a race who lives half as long as a human will experience a much faster life cycle, experience a childhood that's about half as long as expected.

The trope applies primarily to a creature's natural lifespan and rate of aging. A character who gains slower or more rapid aging artificially or as part of something that occurs later in life is less likely to qualify for this trope. Artificially created creatures that have this lifespan and aging built into them or artificial procedures performed very early in life can be included.

Relative emotional maturity is also an expected element of this trope, but not a required one. Generally a character who is considered among his kind to be a child at age fifty will think and behave like a child. A character whose race reaches adulthood at age five will think and behave as an adult.

This trope will often overlap with WeAreAsMayflies and may result in {{Mayfly December Romance}}s. Compare ImmortalImmaturity, when a character who is immortal acts immature and childish in contrast to their age.
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[[foldercontrol]]

!! Longer Lifespan, Slow Aging

[[folder: Anime & Manga]]
* Elves in ''Manga/{{Drifters}}'' are stated to have a lifespan about five or six times that of humans, and it shows in their rate of maturation. The youngest elves shown are young boys who, when asked, reveal their ages as thirty-six and thirty-nine. This shocks Toyohisa, since this means they're older than he is.
[[/folder]]

[[folder: Comic Books]]
* In ''Film/MagicalLegendOfTheLeprechauns'' Mikey looks to be in his early twenties, but is stated to be "not even two hundred years old yet." Combined with the knowledge that leprechauns live for a thousand years at minimum, proportional aging seems to be in effect. ''(Needs more context as to whether this is Proportional Aging or ImmortalityBeginsAtTwenty)''
[[/folder]]

[[folder: Film -- Live-Action]]
* ''Film/{{Hellboy}}'': The eponymous character is said to age at one third the rate of a human being and thus has the physical prowess of someone at age twenty when he is sixty years old at the present time of the film.
[[/folder]]

[[folder: Literature]]
* In the ''Literature/HonorHarrington'' series, Prolong has essentially tripled the human lifespan. The treatments must be done in early youth, and as the name implies prolongs ''every'' stage of human development. As a result, characters are OlderThanTheyLook, with individuals in their twenties looking as potentially young as late preteens. The WeAreAsMayflies overlap comes when interacting with planets or individuals who were too old to receive the prolong treatments when they became available. There's also one instance of a MayflyDecemberRomance detailed in the Talbott Quandrant books.
* Hobbits in Franchise/TolkiensLegendarium live slightly longer than humans (to about 120, usually; keep in mind that at the time of writing, a human passing 90 was extremely rare), with proportionate aging. Merry and Pippin, in their thirties, are considered young adults, and Frodo, in his fifties, is just shy of middle age. Hobbits are also noted to have their adolescence in their "tweens."
* In ''Literature/TheWheelOfTime'', Ogier can live for centuries. Loial, the one we see the most of, is ninety years old. By Ogier standards this is considered late adolescence. He is physically mature, but is considered among his kind to be emotionally immature and hot-headed. Nor is he considered old enough to leave the ''stedding'' (Ogier homeland) by himself.
* ''Literature/{{Discworld}}'':
** It's mentioned in ''Discworld/GuardsGuards'' that dwarf children aren't mature enough to be told about sexuality and reproduction until they hit puberty, at about age 50.
** ''Discworld/ReaperMan'' has different life forms experiencing time differently depending on their life spans. Trees have a conversation that takes seventeen years and when one is chopped down, they seem to the others to have simply vanished.
* Ian [=McDonald's=] ''River of Gods'' and related short stories/novellas feature genetically engineered 'Brahmins' who live twice as long but age at half the rate, at least physically. They actually develop faster mentally, fast enough that spending two years as a helpless infant is a source of considerable frustration and misery.
* In ''Literature/TheLostJournalsOfVenPolypheme'', Ven's race has a life cycle about twice as long as a human's, and they age proportionately. Ven is in his twenties but is still an adolescent. The explanation given is that they don't have to grow up as fast since they have longer to live.
* The exact natural lifespan of dragons in ''Literature/SpellsSwordsAndStealth'' is not stated, but it is assumed to be very long as a centuries old dragon who serves as antagonist of the third book is an "elder", but not "ancient" dragon, while a fifty year-old dragon the NPC protagonists encounter is still considered a hatchling.
[[/folder]]

[[folder:Live-Action TV]]
* In ''Series/DoctorWho'', a Time Lord's rate of aging relative to their total lifespan is near impossible to determine, since when their bodies are burned out they [[BizarreAlienBiology rewrite their entire genetic codes]] and [[TheNthDoctor regenerate into a new body with new personality traits]]. Their aging within a single regeneration is clearer. We have seen the First, War, and Eleventh Doctors in old age, with either the statement or implication it took centuries to reach that point. The length of a Time Lord's childhood is unknown, but it's been offhandedly mentioned that Time Lords are still considered "kids" into their one hundreds.
[[/folder]]

[[folder:Tabletop Games]]
* ''TabletopGame/DungeonsAndDragons:''
** D&D Dwarves for instance reach (physical) adulthood at 40 years old, are considered middle aged at 125 and can expect to live for more than three centuries baring violence. A D&D Elf is not considered an adult until he hits ''110'', meaning an ancient human, a Dwarf who is in the prime of his life and an Elf in the equivalent of her late teens might all have been born in the same year.
** Depending on the source, elves are often actually physically mature around the same time humans are (most of ''Literature/TheLegendOfDrizzt'' takes place when the title character is in his thirties or forties), but they're not regarded as adults by ''other elves'' until they've passed their first century.
* ''TabletopGame/{{Warhammer 40000}}'':
** {{Space Marine}}s age very, very slowly, since the process that turns them into superhumans begins around adolescence and takes years to complete. For example, [[http://spacemarine.wikia.com/wiki/Leandros these]] [[http://spacemarine.wikia.com/wiki/Titus three]][[http://spacemarine.wikia.com/wiki/Sidonus Astartes]] are 75, 175 and 250 years old respectively. However, it''s usually harder to tell, since liberal use of BaldOfAwesome hides the age difference.
** Juvenat treatments, reserved for the Imperial elite, drastically slow down the rate of aging, allowing some recipients to be pushing two centuries and still fighting ([[CiaphasCain or running away]]).
[[/folder]]

[[folder:Video Games]]
* ''VideoGame/{{Xenoblade}}'':
** The High-Entia are a [[WingedHumanoid winged]] [[OurElvesAreDifferent elf-like]] race with a lifespan going into at least the 400s. Their physical ages are proportionate to their chronological ones. High Entia children have ages in the 30s-60s while young adulthood seems to be around the mid-late 100s and old age being the high 300s.
** The [[spoiler: Machina]] are another example, having lifespans going well into the thousands and seemingly aging proportionate to them. However, [[spoiler: being as they're machines/cyborgs it's unknown if they actually ''age'' as biological beings would.]]
* In ''[[VideoGame/FireEmblemElibe Fire Emblem: Binding Blade]]'', the manakete Fa looks and acts like a young child even though she's several centuries old. It's mentioned in support conversations that manaketes just age that slowly--she will, ''eventually'', look like an adult.
* In ''VideoGame/SwordOfTheStars,'' Liir reach maturity at the age of fifty and live for centuries, possibly millennia [[spoiler: if they escape gravity's influence on the SquareCubeLaw.]]
* ''VideoGame/BlazBlue'': Celica has a special kind of soul that, along with bestowing her the ability of HealingHands, lets her age more slowly and live for longer. Despite looking like someone in her mid-teens, she's actually a young adult. Her older self just looks like a woman in her 30s despite living for around a century.
* The Asari in ''VideoGame/MassEffect'' can live to around a thousand years old and age slowly, seeming to reach the equivalent of sexual maturity in their 40s. Liara is 106 and seems to be the equivalent of her early 20s. They also have [[TheThreeFacesOfEve three distinct phases of life]], Maiden, from puberty until around 350 when they enter the Matron stage and start having families, and then Matriarch around the age of 700 until their deaths.
* In ''VideoGame/Disgaea'' Demons and Angels seem to age 10 times slower than humans
[[/folder]]

[[folder:Webcomics]]
* Elves in ''Webcomic/TheOrderOfTheStick'' are shown to experience this. Vaarsuvius' [[http://www.giantitp.com/comics/oots0629.html two children are 26 years old]]. For elves, this is the equivalent of kindergarten-age.
* Kayoss in ''Webcomic/LsEmpire'' age about 100 times slower than humans. Although they grow proportionally to that of a human, they don't reach sexual maturity until they're in their 2000's.
[[/folder]]

[[folder:Web Original]]
* ''Scientifically Accurate Ninja Turtles'' notes that since turtles live for two centuries, "teenagers" would have the minds of seven-year-olds.
[[/folder]]

[[folder:Western Animation]]
* While the total lifespan of the titular''WeseternAnimation/{{Gargoyles}}'' is not stated, in the Season 2 episode "Grief" Goliath explains that Gargoyles age at half the rate of humans. This can be seen when Goliath and Eliza meet Tom. Tom was a child back in the Manhattan Clan's original time and helped care for the unhatched Gargoyle eggs in the castle rookery. When they meet Tom as an adult, he's old enough to have significant amounts of gray in his hair, but the Gargoyles he helped nurture are still adolescents.
''(Needs more context, how long do Gargoyles live normally?)''
[[/folder]]

!! Shorter Lifespan, Fast Aging

[[folder:Literature]]
* In the ''Franchise/StarWars'' prequels. Clone troopers age twice as fast as baseline humans and live half as long. An attempt to fix this is used as a subplot in the ''Literature/RepublicCommandoSeries''.
* ''Discworld/ReaperMan'' has different life forms experiencing time differently depending on their life spans. Elderly mayflies at sunset are seen reminiscing about how the sun was properly yellow and high in the sky when they were young.
[[/folder]]

[[folder:Live-Action TV]]
* ''Series/StarTrekVoyager'': The Ocampa only live 9 years, and by age 1 are fully adult.
[[/folder]]

[[folder:Video Games]]
* In ''VideoGame/SwordOfTheStars'', Zuul grow to full size in a matter of months and usually die of natural causes before they turn 40.
* The hozen of ''VideoGame/WorldOfWarcraft'' are a very short lived race. Their elders are typically just over twenty years old.
[[/folder]]

[[folder:Webcomics]]
* ''Webcomic/KevinAndKell'' has [[PlayedForLaughs played this for laughs]] with [[http://kevinandkell.com/2002/kk0814.html actual mayflies]]. Such comics often show them being born and dying within the course of the same strip.
[[/folder]]

[[folder: Western Animation]]
* In ''WesternAnimation/FantasticMrFox'', the concept of fox-years implies that foxes age six times as fast as humans. Ash is two years or twelve fox-years old, and is about as mature as a twelve-year-old child, while Mr. Fox is seven years old (which would be forty-two fox-years), and has midlife crisis.
[[/folder]]

[[folder: Other]]
* The traditional illustrations of Baby New Year, who is a baby on January 1st and ages into an old man by December 31st, when he dies to be replaced by a new Baby New Year.
[[/folder]]

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