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[[quoteright:300:[[ComicBook/SabrinaTheTeenageWitch http://static.tvtropes.org/pmwiki/pub/images/aug021854_3_sx360_ql80_ttd.png]]]]

A character is aged, usually to adolescence, after being in another dimension, time travel, or other [[AppliedPhlebotinum application of phlebotinum]], often to get a main character's kid to "speaking age" or otherwise build them up to be able to take part in that world's adventures. Often done with clones (which would normally be born as infants), to age them up to fight the main cast. Done for the same functional reasons as the [[SoapOperaRapidAgingSyndrome inexplicable age-up]] in sitcoms, and easily spotted in advance if the presence of a baby or little kid doesn't make sense in the long run.

Often the reason this happens, as opposed to simply bringing in an older character in the first place, is writers want to use some kind of girl-is-pregnant storyline, but aren't willing to wait the fifteen or so years before the baby becomes interesting. Common if the child is TheChosenOne.

Occasionally, the writers will decide the age-up was a mistake (or won't be able to hold onto the age-up actor), and will revert the character back to where they started.

Differs from SoapOperaRapidAgingSyndrome in that there is an actual in-story explanation, regardless of its believability, for the rapid maturation of the character. It should be noted that with clones it happens so frequently (mostly in order to bring them up to the same apparent age as the persons they were cloned from) that in many cases the writer [[HandWave does not even bother to explain how it is done]]. Also differs from TimeShiftedActor, which is where two actors play the same character at different stages of their life - one which progresses at a normal pace.

Sometimes, especially for female characters, there may be some events similar to ShesAllGrownUp.

A SubTrope of OvernightAgeUp. See also TimeSkip, where it's the show that jumps ahead, not a character, and RapidAging.



[[folder:Anime and Manga]]
* Used to disturbing degrees in ''Manga/HunterXHunter'', where [[spoiler: Gon]] forcefully causes his body to age up to defeat [[spoiler: Neferpitou]], greatly increasing his nen, at the same time shaving decades off his life span, very nearly causing him to never be able to use nen again and leaving his body a shattered and bloody mess afterwards.
* In ''Anime/GunBuster'', they make use of a more or less realistic interpretation of time dilation as they get closer to the speed of light. This resulted in one of the characters going from sixteen to mid-40's while the main heroine, Noriko Takaya, aged a mere year or two.
* In ''Anime/RahXephon'', [[spoiler:Haruka and Ayato were the same age in the past; at the time of the series, Ayato is 17 and Haruka is 29 due to time passing differently inside and outside of Tokyo]]
* Hotaru in the final season of ''Manga/SailorMoon'', after suffering a [[FountainOfYouth plot-relevant age-]]''[[FountainOfYouth down]]'' more than a season before.
** Chibi Usa also goes through this when Wiseman transforms her into the DarkMagicalGirl villainess Black Lady. She is healed at the end of ''Sailor Moon R'' and becomes a child again. It then happens ''again'' in both the [[Manga/SailorMoon manga]]'s Dream Arc and a single episode of the ''[=SuperS=]'' anime, where she and Usagi actually swapped ages. The anime and the manga have different reasons and solutions for this problem.
* ''Anime/StrainStrategicArmoredInfantry'' has enough TechnoBabble about sub-lightspeed travel that you never know [[ReallySevenHundredYearsOld just how old anybody is]], although they all feel the age that they appear to be. [[spoiler:The ending also ages up the entire Space Squadron save Sara herself.]]
* Also happens to Chris Thorndyke in ''Anime/SonicX''. Unfortunately when he travels to Sonic's world an inconvenient time warp sticks him back in his twelve year old body. This left the audience dealing with a more mature and useful Chris while keeping his more familiar body, making it easier for animators who had been drawing him as twelve for a couple of years now. There were certainly [[RescuedFromTheScrappyHeap fewer complaints about him afterwards]].
* Hana-chan does this in the first episode of ''Anime/OjamajoDoremi Dokkan'', turning from a baby to an 11-year-old girl so she can go to school with her mommies.
* In ''Manga/MagicKnightRayearth'', Ascot ages fast with ''sheer willpower'' because of a crush on the significantly older Umi. Having a entire world run on willpower can be useful sometimes.
* Subverted in ''Anime/PrettySammy''. Washu's Dangerous Drink turns Sasami into a sexy teenager, but only for a short while: by the next day, it has backfired, and she's become a toddler. When Washu does the same thing to Pixy Misa, the result is a battle between (probably) the youngest pair of magical girls in the genre.
* Vivio, near the end of ''Anime/MagicalGirlLyricalNanohaStrikers''. [[spoiler:The villains do this to have her fight Nanoha]]; presumably she couldn't access her powers as a child. She eventually reverts to her younger form, [[spoiler:after being defeated by Nanoha.]]
** When she gets older, she gets the ability to switch to "adult mode" at will.
* [[spoiler:Nelliel Tu Odelschwanck]], formerly [[spoiler:Nel]], of ''Manga/{{Bleach}}'' temporarily grows back to her true age when Ichigo suffers a severe beating from Nnoitra. She promptly returns the latter the favor.
** After some rigorous offscreen training in the dangai, where time passes exorbitantly fast, [[spoiler: Ichigo]] returns looking [[ShesAllGrownUp all grown up.]]
** Eventually, in the Vandenreich arc [[spoiler: Urahara gives Nel a device that allows her to grow to her true age ''and'' stay as such, so she can fight alongside Ichigo and the TrueCompanions from then on.]]
* ''Manga/MahouSenseiNegima'' has pills that allow one to increase or decrease your age at will. They see quite a lot of use.
** There's also a more subtle version going on in regard to Negi's constant use of various YearInsideHourOutside items; he's aged himself up by at least a year, if not more, in less than six months. It mirrors his [[WiseBeyondTheirYears ever-growing maturity]].
* ''Manga/KatekyoHitmanReborn'': Instead of 8 year old Futa also being involved in the Future Arc, his 18 year old self stays to be a competent supporting cast. Doesn't happen with Lambo and I-pin, though.
* In ''Manga/DragonBall'', Piccolo grows from a small child to an adult in a span of three years, probably because it would be a little strange for Goku to fight a little kid who wants to take over the world.
** This is made even more obvious by the fact that Goku himself [[NotAllowedToGrowUp doesn't physically age]] at all until a TimeSkip that is setting up [[Manga/DragonBallZ the next series]].
* Kon from ''Manga/{{Amatsuki}}'' spends two years in the virtual world before his classmate Toki arrives there, allowing him to grow into a BigBrotherMentor figure for the latter.
* Ashura of ''Manga/RGVeda''. Yasha found him as a baby. Just hours later, he grew up to a 5-6 year old child able to travel around. Later on, he grew to a 9-10 year old child after awakening Shura-toh. [[spoiler:And after Shura-toh's seal was broken, he became a full grown adult]].
* [[spoiler:Aguri Madoka, alias]] Cure Ace of ''Anime/DokiDokiPrettyCure'' is revealed to do this.
** Averted with Masked Cure Muse of ''Anime/SuitePrettyCure''. [[spoiler:It's just a disguise Ako wore to make herself looking older, including stilted boots.]]
* Sooooorta used in ''Manga/FushigiYuugiGenbuKaiden'': [[spoiler: Tegu and Hagas are twin brothers, but for VERY complicated reasons Hagas looks his age of 18 while Tegu looks like a boy under 10. Hagas, knowing that [[IllBoy he doesn't have much time to live]], brews a SelfSacrificeScheme and as a result, as soon as he dies, the surviving Tegu both inherits their shared title of "Urumiya" the Genbu Senshi (and the powers associated to it) ''and'' is able to physically grow up, almost instantly going from [[OlderThanTheyLook a grown man in a young boy's body]] to the older teen he should have always been.]]
* Happens briefly in ''Anime/DogDays''[='=] second season: when fighting a horde of demon rats that eats the "age" from people ([[FountainOfYouth de-aging them temporarily]]), Adele gives Shinku and Gaul magic gemstones to act as protective charms. After blocking an attack from the "boss" rat, the SmokeShield clears, revealing that the two have been aged-up to adulthood and promptly kick the demon's butt. They revert to their real ages a few minutes after everything's settled, but not before the girls present have ample opportunity to {{Squee}} over how [[{{Bishonen}} handsome]] Adult!Shinku and Gaul look.
* In ''Anime/TowardTheTerra'', when Nazca is [[EarthShatteringKaboom under attack]] by the [[WaveMotionGun Meggido]] the seven Children of the Mu instantly age themselves from toddler to teen and teleport themselves into space to reenforce the shield Blue and Jomey have just created.

[[folder:Comic Books]]
* Marvel really has a lot of these:
** ComicBook/IllyanaRasputin of ''ComicBook/NewMutants'' went from six to thirteen ''in the middle of a rescue attempt'', due to a [[YearInsideHourOutside time rate differential]] between Earth and the hell-dimension in which she was trapped. Nowadays, she fluctuates between being around an older teenager to being in her early twenties.
*** The same happened to Marrow, only with her place being a pocket dimension called "The Hill".
** Fellow X-character Nathan Christopher Summers is sent into the future as a baby and later comes back (roughly the same age as his grandfather) as Comicbook/{{Cable}}. Of course, he came back before he left, so at one point, both Adult Cable and Baby Cable were around at the same time.
*** And now we have Cable's protegée, Hope. It involves a lot of different futures.
** Nate Grey, a.k.a. X-Man, Cable's counterpart from the ComicBook/AgeOfApocalypse, was created from the DNA of Jean and Scott, then aged up into the ultimate telepath and telekinetic.
** From ComicBook/XFactor: [[spoiler: Layla Miller]]'s ''barelylegalification'' has her going to the future and coming back.
** For a while even [[ComicBook/FantasticFour Reed and Sue Richards']] son Franklin fell victim to this trope, being kidnapped into the future and coming back as the teenage ''Psi-Lord''. Silly, yes, but it did give young Franklin's tremendous mental powers a break from DeusExMachina and/or PubertySuperpower duty - his older self was in control of them. It was, of course, later reversed.
** ComicBook/CaptainAmerica's ArchEnemy the ComicBook/RedSkull used his DeusExMachina to age his daughter DaddysLittleVillain Sin from a 13 year old CreepyChild EnfantTerrible into a 23 year old AxeCrazy DarkActionGirl that makes her father look sane by comparison.
** Tommy and Billy, the twin children of the ComicBook/ScarletWitch and ComicBook/TheVision, died as infants, but were reincarnated as teenagers years later in ''ComicBook/YoungAvengers''.
** in ''ComicBook/YoungAvengers'' Vol. 2, [[spoiler: Kid!Loki is aged up to Teen!Loki by Billy's magic]] in a plot to get his powers back. It worked to an extent.
*** This has the fortunate side effect of now making him resemble [[spoiler: Creator/TomHiddleston]].
** [[Comicbook/IncredibleHulk The Hulk's]] sons Skaar and Hiro-Kala are physically young teens, but chronologically only a couple of years old, partly thanks to their mother being one of the alien Shadow People, who have an accelerated maturation rate. Skaar actually has a "puny" (human) form that is at least still a child.
*** When you consider Skaar's the first Hulk "person" to grow up from birth on-screen, his growth, muscle tone and mental development rate may be the norm. To give reference, in Son of Hulk #1 even as a newborn Skaar appeared to be nearly as large as one of Miek and the Brood's offspring and stronger than them.
** Most of Marvel's clones were subjected to accelerated aging, mostly to bring them up to the age of the persons they were cloned from and make them indistinguishable from them. Examples include the clones of Gwen Stacy and Spider-Man (Ben Reilly and Kaine), Jean Grey's clone Madelyne Pryor in the main timeline and either ComicBook/SpiderGirl or May "Mayday" Parker and April Parker in the MC-2 universe.
*** In the Ultimate Universe, Peter Parker was cloned (at least) five times (including different-sex clone Spider-Woman). Four were force-aged to Peter's age, one was aged to that of his father in order to impersonate ''him''. This last clone did not stop aging more rapidly than normal and died of it.
** ComicBook/NormanOsborn artificially aged his twin children by Gwen Stacy so that currently they are the same age-group as their late mother.
** ComicBook/TheMightyThor inverted this, giving Loki a Plot Relevant Age ''Down'' where he was reincarnated as his child self after dying. It avoided being {{Narm}} or too heavy-handed when an echo of the older Loki revealed his reasons for having it happen. Preteen Loki has been hugely popular, making it work very well. And then he got two age ups as well. The first is the one mentioned under ''Young Avengers'' (to young adult) the second happened in ''Comicbook/LokiAgentOfAsgard'' when the jerk chose to remake themself rather than turning evil evil again (to thirty something).
** Avengers #200. Ms. Marvel is impregnated, gives birth, the child ages to adulthood, and "marries" his mother in the course of a few days. Look it up. Led to a big time WhatTheHellHero / TheReasonYouSuck Speech from Carol sometime later.
* DC:
** Alexander Luthor, Jr. in ''[[CrisisCrossover Crisis on Infinite Earths]]''.
** Arisia from ''ComicBook/GreenLantern'' physically ages herself from about 13 Earth years to at least 18 Earth years so she can pursue a crush on Hal Jordan. Later, to make Hal Jordan not look like a skeeve, this was subject to several {{Retcon}}s, and, in current continuity, 13 years on her world are equivalent to 240 on Earth.
** While the PhantomZone normally suspends aging, Comicbook/{{Superman}}'s son Chris emerges from its imprisonment as a teenager.
** ComicBook/InfiniteCrisis did this to Bart Allen/Kid Flash via spending four years in an alternate dimension accessed via the Speed Force, thus turning him into someone old enough to be the new Flash (after spending a while, [[RefusalOfTheCall Refusing The Call]]) while Wally and his family were on another planet. He was then the new Flash for a while [[spoiler:until Inertia, his EvilTwin, got the RoguesGallery together and killed him, perhaps [[ExecutiveMeddling to make room for Wally's return]].]]
*** Interestingly, the reason Wally was off on the other world was to deal with his speed-powered twin kids who were receiving the same treatment- they're chronologically less than two but look eight or so, [[spoiler:and nobody knows if their aging has truly evened out or if it's temporary: any given morning Wally and Linda could wake up to find them teenagers or senior citizens or dead,]] so they're being rushed into the [[LegacyCharacter Family Business]].
** Duela Dent, "The Harlequin", was a '70s Comicbook/{{Teen Titans}} character who was apparently the daughter of a post-Two-Face Harvey Dent. As her age never made sense with the timeline (otherwise she would have been a small child instead of a teenager), Marv Wolfman had her origin revealed as a lie in the pages of ''New Teen Titans'', while George Perez drew Duela to suddenly look as if she were in her thirties or forties to emphasize that she had to be too old to be Two-Face's daughter. An older Duela was also briefly seen as an asylum patient in ''Team Titans'', although when the character was formally allowed back into Titans continuity, later artists and writers aged her back down.
*** Other Titans, ComicBook/HawkAndDove, underwent this in a guest appearance in ''The Brave and the Bold'' in the 1970s. Overlapped with a bit of a ContinuitySnarl, as Hank and Don were aged up to being adult men while the rest of the DCU didn't age with them. Marv Wolfman then poked fun at the continuity error in their cameo at Donna Troy's wedding, with the college-aged Hank and Don being baffled when someone had the impression that they were much older.
* Right before the ''VideoGame/SonicAdventure'' arc of the [[ComicBook/SonicTheHedgehog Archie comics]], Amy Rose does this to herself with a wish to justify her joining the party; otherwise, the rest of the gang would've forbidden her from joining for being too young, and the whole game tie-in thing would fall apart.
** Apparently the same thing happened to her [[EvilTwin negative-dimension counterpart]], [[{{Yandere}} Rosy Rascal]], although her reasons for wanting to be older [[LoveMakesYouEvil weren't quite so noble.]] [[LoveMakesYouCrazy It had the side effect of breaking her brain]], turning her into a [[AxCrazy dangerous psychopath.]] And you thought ''Amy'' [[ClingyJealousGirl was possessive...]]
* Jenny Quantum of ''ComicBook/TheAuthority'' does this to herself. After meeting the incarnations of centuries past and becoming aware of the current problem, Jenny uses her quantum powers to go from six years old to high school age.
* ''ComicBook/GoldDigger'' has Brianna, an accidental [[CloningBlues composite clone]] of Brittany and Gina. She was born fully grown, with both sets of memories, and had to establish an identity for herself. It was eventually established that some of her more childish personality traits owe to the fact that her ''soul'' is still her real, chronological age, and never got to experience a real childhood. Her [[spoiler:sadly deceased]] granny was the only person insightful enough to treat her with the level of affection she would give a little girl.

* Happens to the main character of the WesternAnimation/MyLittlePonyFriendshipIsMagic fanfic FanFic/TheTwilightChild in an attempt to give herself wings, which only results in aging herself by four years. [[DeconstructedTrope Deconstructed]] since as a result she skips straight into full-blown puberty, with all the problems that lie therein, and her suddenly larger body takes some time to get used to, both of which make herself even more of a social outcast than she already was, and no attempt to "undo it" will work. And she doesn't get any wings anyway. [[spoiler:It's later revealed that part of the reason it can't be undone is because of the Nightmare possessing Twinkle. It's finally undone when the Nightmare is removed from Twinkle's body for good.]]
* In ''FanFic/TheEndOfEnds'', [[spoiler:Beast Boy undergoes one after being possessed by the Dark Prognosticus]].

[[folder:Films -- Animated]]
* In ''WesternAnimation/TheLandBeforeTime'', Spike is shown hatching in a patch of grass Ducky finds his egg in. Cut to outside the grass, and Spike inexplicably comes out looking the same age as the rest of the main cast. Of course he could just be big for his age.
* Several movie franchises play with this, specifically ''Disney/TheLionKing'' and ''WesternAnimation/IceAge''. As the kids will age up, but no-one else shows any signs of aging at all. Simba and Peaches will grow into teenagers while all the other characters (aside from other kids) seem to be frozen in time. Timon and Pumbaa are probably the worst offenders in movie history, as they're adults when Simba is a baby. Cue when Simba is a father even when his daughter reaches adulthood, they're still exactly the same. Possibly [[JustifiedTrope justified]], as for most non-human species the aging from childhood to adulthood is a matter of a mere year or two. Lions reach sexual maturity between 3-4 years old and live to about 16, while meerkats reach maturity at 1 and live on average to 6-10.
* In ''Animation/TheReturnOfHanuman'', Hanuman reincarnated as Maruti rapidly ages into an elementary school student in three months in order to quickly help an elementary school boy from being bullied.

[[folder:Films -- Live-Action]]
* Saphira in the [[TheMovie film version]] of ''Film/{{Eragon}}''. In the span of exactly one minute, she goes from a cute baby/child dragon to a fully grown adult capable of speaking telepathically (in [[Creator/RachelWeisz an audibly adult female voice]]) and carrying Eragon on her back. This effect comes complete with flashing lights, sound effects, and a generous smoke screen to hide the actual transformation.
** Eragon blessed a baby who grows to about four years old in her next appearance. It turns out he actually cursed her, forcing her to eat huge amounts of food, making her mature mentally and physically at a rate far faster than normal. ItMakesSenseInContext.
* In ''Film/{{Warlock}}'' the titular EvilSorcerer cursed the heroine to age by 20 years ''each day'' just ForTheEvulz. However, she managed to reverse the spell and restore her youth.
* In ''Film/{{Excalibur}}'', Morgana ages her son Mordred from a child to a young adult in order to face Arthur in combat.
* In ''Film/TheIcePirates'', Karina gives birth to and raises a son to adulthood while the ship is passing through a time-warping zone. The journey takes only a few minutes of screen time.
* In ''{{Film/Dinocroc}}'', the titular creature is roughly the size of a large dog in the opening scenes. Cut to a few days later and it's grown to the size of a large truck able to fit an entire teenager over the length of its jaws. Partially justified as it was engineered to have a ludicrously fast growth rate and was said to have previously grown about half a meter in a single day.

* In Creator/DouglasAdams' novel ''Literature/MostlyHarmless'', Trillian's daughter Random goes into an intergalactic daycare as a preteen and comes out past puberty. It turns out the daycare was also temporally displaced, and the time you come back is random.
* This is the main plot of Creator/WilliamSleator's ''Literature/{{Singularity}}''. One twin locks himself inside a YearInsideHourOutside device, so that he'll be a year older than his twin and thus no longer a twin.
* [[InvertedTrope Inverted]] in the Literature/{{Discworld}} novel ''Discworld/WyrdSisters''. A three-year-old Rightful King is useless, but an 18-year-old Lost Prince is generally pretty reliable when it comes to overthrowing the Usurper. So the titular witches send the Prince away, then move ''the entire kingdom'' 15 years into the future, so the people won't have to suffer under the mad duke.
* In the last of Creator/PiersAnthony's ''Literature/ApprenticeAdept'' books [[TheScrappy Wunderkinds]] Flach and Nepe age a decade between chapters. [[spoiler:A good chunk of the cast is hiding out in a hidden underground stronghold, magically gimmicked to speed up time twenty-fold]].
* In ''Literature/TheGapCycle'' by Creator/StephenRDonaldson, Davies Hyland is force-grown from a fetus to a 16 year old teen. He's also implanted with the mind of his 22 year old ''mother''.
* In Creator/CordwainerSmith's story ''The Dead Lady of Clown Town'' the major character D'joan (later Joan) is force-grown from age five to age sixteen in one night.
* In the MagicTheGathering book ''Legions'', the reincarnated Kuberr grows up in the course of a few weeks. Justified in that he is a reborn god (of wealth no less) born of Phage and the Patriarch who are basically incarnates of death themselves) and is actually growing at a rate that corresponds to the number of deaths in the world, while a war is going on.
* In the ''Literature/{{Animorphs}}'' companion and backstory book "The Andalite Chronicles", Loren ages from about 13 to around 18 in the course of a few minutes after a botched attempt at using the Time Matrix strands them in a weird, mixed reality: at the center is a time paradox, explained with lots of TechnoBabble, that basically runs much faster than normal. They have to enter here to regain the Time Matrix and travel back home. Loren uses it's ability to hedge the details of reality to make sure nobody at home notices, either.
* In ''The Snow Queen'' by Hans Christian Andersen, the main character Gerda rescued her friend Kay from the Snow Queen, after he was inflicted by a shard of the devil's mirror and turned cruel and cold-hearted. But when they arrive back home in their garden, they turn to find themselves both adults. Poetically, the whole adventure portrayed their adolescence.
* In the ''Literature/DoctorWhoNewAdventures'', teenage ActionGirl Ace gets [[SinkOrSwimMentor betrayed by the Doctor]] one too many times, and leaves him. Four books later, the Doctor arrives in ''almost'' the same time period, and cynical twentysomething mercenary Ace rejoins the TARDIS crew.
* ''Literature/StarTrekNewFrontier'' does this to Xy, the son of Burgoyne and Selar. In the three-year gap between ''Stone and Anvil'' and ''After the Fall'', he goes from young toddler to science officer. The reason is that the combination of Vulcan and Hermat DNA makes him age super-fast...but it also means that he'll die before either of his parents. [[spoiler:That is, until his mother [[HeroicSacrifice gives her life]] to get him a means to extend his life in ''Treason''.]]
* The first year in the mill in ''Literature/{{Krabat}}'' counts as three. Becomes important because at the beginning of the story, Krabat was too young to be interested in girls (and he needs a girl to defeat the villain). Justified by magic.
* About a third of the way through Jerry Ahern's ''Survivalist'' series, the Earth's atmosphere catches fire (don't ask; it's nonsensical but awesome). John Rourke and his family and two best friends have managed to gain possession of some suspended animation booths, and go to sleep for the estimated 500 years it will take for the oxygen level of the atmosphere to recover sufficiently. Unbeknownst to the others, John sets his booth to wake him up about twenty years early. When he discovers that there's enough air to get by Denver-style, he wakes up his 8- and 6-year-old children, spends a few years teaching them survival basics, and then goes back to sleep himself for another decade-and-a-half. Then all the adults wake up as scheduled to find that the kids are suddenly twenty years older than they remember (Mom, in particular, is pissed). John doesn't attempt to dress up the fact that he did this in order to make their little group into three possible breeding pairs rather than the two it would have been (no, not the siblings; the daughter with the other adult male and the son with the other adult female), just in case it turned out they were the only surviving humans. They weren't, but it was a very pragmatic plan, and the predicted couples did end up together eventually anyway.
* In Creator/HPLovecraft's ''Literature/TheDunwichHorror'', [[HalfHumanHybrid Wilbur Whateley]] grows to young adulthood within five years of his birth.
* In Literature/TimeScout [[spoiler:Armstrong, Marcus, and his children]] run to Denver, then to London. They show up in London a few hours before they leave for Denver, three years older. Tragic, as it means that [[spoiler:Ianira has lost three years of her children's lives.]]
* In ''Darke'', the sixth book of ''Literature/SeptimusHeap'', Jenna and Septimus have gone from 12 years in the preceding book ''Syren'' to 14 years, where he will have to have the Darke Week[[spoiler: and she will become Queen]].
* The title character of ''Literature/TheSagaOfDarrenShan'' had been turned into a [[{{dhampyr}} half-vampire]] in the first book of the series, when he was 12. This meant he aged one year in every five, so when he was thrown into a vampire war fourteen years into the series, [[YoungerThanHeLooks he looked to be around 15]]. Cue came the "Purge", basically the half-vampire [[OurVampiresAreDifferent counterpart of pubescence]], which allowed him to age up a few years.
* In ''Literature/GalaxyOfFear: Army of Terror'', [[PokemonSpeak Eppon]] is found appearing to be a year old, but [[spoiler: whenever he's alone with someone he eats them]] and gets older and larger. Within hours he seems to be a teenager. [[spoiler: Soon after that he turns into a monster.]] Though people initially assume he's an orphaned human, they quickly conclude that he's not.
* The Tendu of ''Literature/TheColorOfDistance'' have multiple stages in a [[BizarreAlienReproduction mature life cycle]]. Egg, narey, tinka, bami, elder, and enkar. Eggs become narey and narey become tinka on their own, but the other stage changes are induced by mature Tendu. The bami Ani becomes the elder Anito in one short session, as TheDeterminator tinka becomes the bami Moki later. Tinka-bami is the most extreme change, as it comes with sentience and being seen as a person.

[[folder:Live-Action TV]]
* ''Series/{{Angel}}''
** In season 3 when Angel's son was born, kidnapped, sucked into another dimension where time moves faster, he comes back as a 16 year old.
** Also used when Buffy apparently kills Angel, but actually sends him to a hell dimension at the end of season 2. When he returns months later in Season 3, he is actually several centuries older. Of course, being an immortal vampire, he looks exactly the same. His mind, [[InsaneEqualsViolent on the other hand]]...
* Percy goes from a teenager to an adult in between the two seasons of ''Series/{{Starhunter}}'', despite supposedly being trapped where she couldn't age at all. This is likely due to DawsonCasting: Percy was played by 25-year-old Tanya Allen, and, since the second season was filmed 3 years later, she couldn't pass for a teenager anymore.
* Isabelle in ''Series/TheFortyFourHundred'', later doing the reverse and temporarily de-aging for plot relevant reasons.
* ''Franchise/StarTrek'', from ''[[Series/StarTrekTheNextGeneration The Next Generation]]'' on, uses this a lot, almost always in the form of using BizarreAlienBiology to HandWave {{SORAS}}:
** ''Series/StarTrekDeepSpaceNine'' actually did a one-shot of this trope, where the O'Briens' toddler daughter Molly fell into a time portal, and grew to adulthood before coming back. Fortunately, when she went through the portal again, it sent her to the same time as before, and she sent her younger self back.
** They also did this with Worf's son Alexander, justifying it by establishing that Klingon children mature very fast. Alexander was played by several different actors and always behaved about as old as he looked. ''[[Series/StarTrekDeepSpaceNine Deep Space Nine]]'' really pushed it by making him physically and mentally a young adult at the chronological age of, oh, seven. (The fast aging is especially odd if you consider that Klingons also live longer than humans, a fact established so Klingons from TheOriginalSeries could show up.)
** Klingons aren't alone in this, by the way. The most extreme example is ''[[Series/StarTrekVoyager Voyager]]'''s Kes, whose race has a nine-year lifespan. In one alternate future episode, Kes had a daughter with Tom Paris... and that daughter was old enough to marry Harry Kim within a year or two.
*** Deep Space 9 also has the Jem'Hadar, who age incredibly fast because of special genetic modifications.
** Voyager also has Naomi Wildman who is 1/2 Human - 1/2 Ktarian. At age 2 chronologically, she looks and acts like an 8-year-old Human. This was justified InUniverse by her half-alien biology. Another side effect is her gestation was approximately 18 months.
** Another ''Series/StarTrekTheNextGeneration'' example: At the start of season two, Troi goes from newly pregnant to having a baby in a few days. The kid then grows from babyhood to about ten years old in a similar space of time, before "dying". [[spoiler: Turns out the "kid" was a benign energy-based alien who wanted to experience corporeal existence, and was grateful for all the affection Troi showed "him".]] This was actually one of the first episodes to [[GoodTroiEpisode really cement Troi's position on the show and make her something other than a walking plot device to read minds.]] This may be explained, however, by the fact that the episode was one of those originally written for ''Star Trek: Phase II'' before that series was scrapped and replaced by the first movie. The original script centered around Lt. Ilia.
* ''Series/StargateSG1'':
** In the final season, Vala gives birth to Adria, who is introduced as a plot point. Adria is an engineered leader of the bad guys who grows to adulthood in just a handful of episodes.
** Adult character Teal'c was also aged to extreme old age for his species due to TimeTravel. He had to go back in time to prevent the problem they'd spent the last fifty years on, so his change is for keeps, carrying over to ''The Ark of Truth'' and his ''Series/StargateAtlantis'' guest appearance.
** There was also the episode where Jack O'Neill was aged to geezer status... by a nanotech STD, no less!
* ''Series/PowerRangersSPD'': child villain Mora is turned into adult villain Morgana... which turns out to have been her true form all along. But she prefers being a child and gets herself changed back.
* Happens more than once during ''Series/XenaWarriorPrincess'':
** Gabrielle's daughter Hope does so and becomes her mother's EvilTwin.
** Inverted later when Xena and Gabrielle [[HumanPopsicle go to sleep for thirty years in coffins of ice]] and awake to find Xena's daughter Eve has aged to adulthood.
* Examine the case of Walt from ''Series/{{Lost}}'': he began the series as a 10 year-old. However, because the first three years of the show covered only the last three months of 2004, actor Malcolm David Kelley quickly grew older than his character. Thus the character was written out in season 2. When the series time-jumped three years after the rescue of the Oceanic 6, Walt returned in a few appearances, having aged appropriately. However, in the season 3 finale, Walt appears to Locke in December 2004, looking as the actor did in 2007. This appearance was referred to in-show as "taller ghost Walt."
* ''Series/UltramanMebius'' takes place 20 years "real time" after the last monster attacked and brings back everyone except Taro's actor.
* In ''Series/{{Hex}}'', Malachi does this, going from an infant to a teenager in a year, due to being half-demon.
* Used in ''Series/DoctorWho''; The newly regenerated Doctor meets the little girl Amelia Pond, who asks to travel in the TARDIS, and the Doctor accepts. Of course, having a little girl around in a show where there's usually at least [[RedShirt one death]] every episode would be a bit dark- and besides, a eight-year-old can't do FanService. So having the Doctor accidentally jump 12 years into the future means that we can now have an all grown up Amy travel with him.
** Doctor Who also has the fastest age-up yet seen. [[spoiler:River Song is introduced as an adult (s04e08) three years before she is born (s06e07) and two years before her parents joined the cast.]]
* In ''Series/{{V 2009}}'', Ryan's daughter is aged up from a baby to a 7-year-old because she is used to test the rapid aging treatment that is used for Lisa's replacement.
* The original ''Series/{{V 1983}}'' did this with Elizabeth (twice!), supposedly because of her HalfHumanHybrid status.
* [[spoiler:Liam Kincaid]] from ''Series/EarthFinalConflict'' grows from a newborn to adulthood during the first part of the first episode of the second season. Explained by his being [[spoiler:one-third]] alien.
* ''Series/TheWestWing'' has an {{Inversion}}: when Zoey Bartlet was introduced in the first season, she was stated to be 19. In season 2 they decided that she was actually 17 so to add drama to the MS storyline.
* ''Series/BabylonFive'':
** In "Babylon Squared" a Starfury pilot passes through the time field around Babylon 4 and dies of old age.
** Inverted with Draal, Delenn's mentor, after he takes control of the Great Machine in "A Voice in the Wilderness". The Machine's life support functions age him ''down'' from a man in his seventies to a man in his forties. However, this was not plot relevant, but rather an excuse for the unavailabilty of the original actor.
** Played straight in "War Without End". Due to having passed through the time field around Babylon 4 back in "Babylon Squared", when the team begins traveling back in time, he rapidly ages. This turns out to be why he couldn't allow Garibaldi to come on the mission.
* ''Series/{{Space 1999}}'': In "Alpha Child", alien influence causes a newborn baby to age instantly to 5-6 years old, allowing him to interact with the Alphans. He subsequently ages again to become [[http://www.imdb.com/name/nm0002103/ Julian Glover]] in SpaceClothes.
* On ''Series/HeroesReborn'', [[spoiler:Tommy and Malina]] were actually born in 2014, the day of the Odessa bombing. [[spoiler:The fact that they are Claire Bennet's children made them a target for Renautas Corporation, who planned to exploit or destroy the children.]] In order to protect them, they were taken back in time to 1999 by Hiro Nakamura [[spoiler:alongside their great-grandmother Angela Petrelli]] and grew up normally so they would be teenagers in 2015.
* ''Gotham'' has a character named Marv with the power to rapidly age others. Normally he uses this to kill people by making them two centuries old, but [[spoiler:an attack on a pre-teen Ivy Pepper is interrupted, leaving her physically in her mid-20s]].
* ''Franchise/SuperSentai'' has several of these. All of which happen with villainous characters:
** ''Series/ChoujinSentaiJetman'' has Tran, a young boy with telekinetic powers. After being bullied by the other villains for his ineffectiveness against the Jetman, he forces himself to grow up into the much more competent [[KnightOfCerebus Tranza]].
** ''Series/ChourikiSentaiOhranger'': After Emperor Bacchus Wrath was killed by the Ohrangers, the Machine Empire Baranoia is briefly taken over by the usurper Bomber the Great, who promptly dispatches himself of the young prince Buldont, who was officially first in line to the throne. Since all the villains are robots, Buldont is subsequently rebuilt in secret by Empress Hysteria, into the much more powerful and adult Kaiser Buldont.
** ''Series/BakuryuuSentaiAbaranger'': The BigBad Dezumozorlya is a parasitic godlike being who needs hosts to survive. His mostly used host in the series is Lije, a young girl who's revealed to be the baby daughter of [[spoiler:Mahoro and Asuka]], aged up into a 12 year old girl. Dezumozorlya later ages his host up to the adult Lijewel, in order to more effectively fight the Abarangers.
* In Season 6 of ''Series/OnceUponATime'' Rumpelstiltskin and Belle's son Gideon is aged from a newborn to a young man in his early 20's through being kidnapped by the Black Fairy and held in another realm where time moves differently. Somewhat justified as it's a prison realm to contain the Black Fairy and the series has shown that in some realms like Neverland time flows differently.

[[folder:Video Games]]
%The Zelda Ocarina of Time example actually goes in Time Skip, not here%
* Aurora of ''VideoGame/ChildOfLight'' gets aged from a young girl to a teenaged lady after obtaining the Stars and Moon. The Sun takes her to adulthood.
* In ''VideoGame/FinalFantasyIV'', Rydia, a young girl when the party first encounters her, is swallowed by the Leviathan and carried into the Eidolons' land of Feymarch. When she is reunited with the party, presumably no more than a few weeks later, she has aged into her early twenties because [[YearInsideHourOutside time passes ''much'' more quickly in the Feymarch]].
** Notably, [[GameplayAndStorySegregation when you actually travel there, you don't get any older.]] However, this makes sense as we see this visit from inside the Feymarch and its faster time stream; outside, presumably, mere seconds pass before the group exits again.
* Ran in ''Twinkle Star Sprites'' ages to somewhere past puberty when she powers up and becomes Princess Sprites. [[spoiler:It doesn't last -- she becomes a little girl again at the end of the game]].
* ''Franchise/MetalGear''-[[TheVerse verse]] [[CloningBlues clones]] age normally up until the time when senescence[[note]]the last cycles of aging[[/note]] starts to set in, which then hits them like a train. This was used to age the main character, Snake, from a young and handsome hero in his early thirties into an OlderAndWiser [[CoolOldGuy forty-something]] in the space of only two years in chronology. In ''Metal Gear Solid 4'', despite the fact that he is chronologically in his early forties, he is, by all appearances and genetic testing well into his seventies. Heck, he looks older than some eighty year olds in the game. [[{{Foreshadowing}} Prior to this]], Snake and Raiden had seen how hard the aging hits with Solidus Snake in ''Metal Gear Solid 2''--despite being chronologically younger than Solid Snake, the Patriots had engaged his accelerated aging process early so that he would appear to be middle-aged during the events of the first game and thus [[spoiler:would be able to fit in the role of being the Patriots' puppet President of the United States. As the elections were rigged, the Patriots needed to make their candidate seems as plausible as possible to maintain their charade.]] By the time of the game's events, Solidus's accelerated aging has gone even further and he rather resembles Snake in Metal Gear Solid 4.
* In ''VideoGame/ShadowHeartsFromTheNewWorld'', Johnny ages-up when in a late-game transformation form. [[spoiler: That is, he becomes his true age while transformed.]]
* In ''Super Marisa Land'' (A ''VideoGame/{{Touhou}}'' version of ''VideoGame/SuperMarioBros1''), Marisa starts as a toddler but ages up and down depending on how many power ups she has.
* ''[[VideoGame/TheBizarreAdventuresOfWoodruffAndTheSchnibble Woodruff and The Schnibble of Azimuth]]'' starts with Woodruff, a toddler, aging into an adult after his adoptive father Azimuth sticks a device on his head. This device turns out to be [[spoiler:an age-adjusting device Azimuth had built as part of a plot to kill the Bigwig. When the Bigwig's men came to capture him, he used it to age Woodruff up so that he could carry on the work; when you meet the (newly-teenaged) Azimuth later, he gives it to you, and you yourself use it to age the Bigwig to dust.]]
* In the ''VideoGame/{{Warcraft}}'' universe, the young archmage Khadgar vanquished his close friend turned FallenHero Medivh by magical means, and in the process suffered a one-off curse that caused him to prematurely age. By the time adventurers re-discover him in the Burning Crusade expansion, he is chronologically in his late 30s or early 40s but physically much older.
** As well, a number of orcs were aged into adulthood by the warlocks to fill the Horde's armies. One notable subject was the half-orc Garona, as part of an effort to [[ContinuitySnarl un-snarl her continuity]] from a series of timeline {{Retcon}}s.
* In the ''VideoGame/SengokuBasara'' series, Ieyasu goes from a BrattyHalfPint to an incredibly muscular and rather attractive adult in the third game. Particularly unusual in that almost none of the other characters mention this transformation.
* ''VideoGame/{{Xenogears}}'' has the RobotGirl Emeralda Kasim. At first she has the appearance of a child, but after a sidequest involving her origins, she becomes an adult with stat changes to boot.
* The FanRemake of ''[[VideoGame.KingsQuestIIRomancingTheThrone King's Quest 2]]'' has this apply to [[spoiler:Possum when she becomes the vampire Anastasia.]] Meanwhile, the [[FountainOfYouth inverse]] happens to [[spoiler:her grandmother when she also becomes a vampire.]]
* In ''VideoGame/BreathOfFireI'', Nina gets sent into the past and suffers amnesia, and spends a few years under the care of some friendly townspeople until you find her and restore her memories. During this time, she has grown older and has developed new abilities, such as being able to become a great bird.
* ''VideoGame/HyperdimensionNeptuniaVictory'' does this in order to disassociate two characters with each other. [[spoiler:Yellow Heart is forcibly adjusted to give her an adult body in order to take full advantage of her insane strength. Her normal form, a kidnapped Peashy, is still a child. Once her memories are restored, she can transform into "the big me" at will.]]

* ''Webcomic/ElGoonishShive'' has the unusual situation of [[spoiler: two characters having their ''souls'' aged by having them experience the normal lives of AlternateUniverse versions of themselves during their dreams. It is [[http://www.egscomics.com/?date=2006-05-03 explained later]] that this was done to prevent insanity caused by them having been [[CloningBlues created with adult bodies and minds but newly-formed souls]], by giving them their own childhood memories.]]
** Also in EGS, the ''in''ability to rapidly age the Lycanthropes plays a small but important part in Grace's BackStory.
* Happens twice in a loudly lampshaded manner in ''Webcomic/PvP'' with Francis and Marcy, the first time with some FourthWallBreaking and the second revealing [[ItRunsOnNonsensoleum questionable rules of ageing]] for the webcomic's world. Technically, they should have already been at that age anyway, but rather than draw them aging in a natural manner from strip to strip, the artist opted to update them all in one shot.
** It also has something to do with Brent's prediction of [[spoiler: when Francis would lose his virginity]] way back when the comic was still comedic.
* In ''Webcomic/TheInexplicableAdventuresOfBob,'' Molly, Galatea, and Djali are species that age from babyhood to vague teenagerdom in the span of one month.
* Done repeatedly and then reversed in ''Webcomic/TheWotch'' to Evan/Lily. It's not actually relevant to the plot a lot of the time, but it has been used for a few story lines.
* [[spoiler: Ranu]] from ''One Question''.
* One of the many effects of the TimeyWimeyBall in ''Webcomic/{{Enjuhneer}}'' is that characters stay the same age for an entire year, then suddenly change in a manner comparative to [[LevelUp levelling up]]. This can cause [[LittleBitBeastly drastic effects]], or can be as simple as suddenly acquiring a pair of WhiteGloves with no idea where they came from.
* A rather odd version of this happens in ''Webcomic/WapsiSquare'' when Shelly, an apparently mostly normal human running around with three golems capable of destroying the world, a body controlled by a coven of demons, a god of alcohol, the atlantian mad scientist who created the golems, and the teleporting woman who controls the golems is suddenly aged up by 80,000 years and revealed to be an immortal and incredibly powerful sphinx... just so she can stay within shouting distance of the massive power levels of the other main characters of the comic. What makes it odd is that she was already a fully mature human woman in her twenties, but she still Aged Up by three and a half orders of magnitude.
* ''Webcomic/{{Kubera}}'':
** Sura age like this as a general rule. They advance in stages, going from first stage (infants) straight to second stage (young children) after a few years. After that, they can spend hundreds of years at second stage, trying to find out what exactly is required for them to advance to third stage, since it's different for everyone. Once they figure it out, the change is virtually instantaneous, and suddenly they're teenagers. The last two stages work the same way.
** A very dangerous murder spell works like this. Leez is afflicted with it, and twelve hours after it is first cast, suddenly finds herself waking up after a nap, having gone from a sixteen year old ButterFace {{gonk}} to a [[SheIsAllGrownUp beautiful young woman in her early-twenties]]. She ''loves'' her new form, and has no idea why the spell is a bad thing...until she's told that she'll die in twelve hours. [[spoiler:The age-up is the ''cause'' of this, not a side effect. Every mortal has a set time when they will die (though they can die sooner due to accidents and so on). The spell brings your body to twelve hours before that appointed time. Though the effect can be reversed (and is, in Leez's case), it doesn't change their appointed time of death]].
* In ''Webcomic/BrunoTheBandit'' Delorus, after becoming a fame vampire, turned into a five- or six-year-old in one shot when her mother ''literally'' [[http://www.brunothebandit.com/d/20021011.html took away her childhood]] and commanded her to "Grow up."


[[folder:Web Original]]
* In ''Roleplay/TheGamersAlliance'', the half-god Nyanna Mikoto's body, despite actually being only a few months old, has grown to resemble a 7-year-old's thanks to divine magic and her unique powers which she can't quite control yet. She has also learned to communicate thanks to the magic of her mother although she has problems grasping basic concepts such as what a 'father' is.

[[folder:Western Animation]]
* Lion-O from ''ThunderCats'', due to [[HumanPopsicle stasis failure.]]
* Enzo and [=AndrAIa=] from ''WesternAnimation/ReBoot'' age from children into adults while trapped inside a game due to time flowing faster there.
** Then the writers missed the young Enzo. So they made a duplicate from a back-up/archived copy. Since everyone is really a computer program, this makes some sense.
* Sari from ''WesternAnimation/TransformersAnimated'' in season 3.
* The Tweebs in the fourth season of ''WesternAnimation/KimPossible'' are an interesting variation: although their art makes them look older, they are not acknowledged as such, but merely advance-placed into Kim's high school during the PostscriptSeason.
* Professor Farnsworth had his crew go out and get "chronotons" for the purpose of doing this to a team of super-mutant babies in ''WesternAnimation/{{Futurama}}''.
* At the end of the second season of ''WesternAnimation/AdventureTime'' Princess Bubblegum is reverted to age 13 as a consequence of her recreation after being possessed by [[EldritchAbomination The Lich]]. In the third season episode "Too Young" she has to age back to 18 in order to take back the Candy Kingdom from Lemongrab. She tells Finn that she always had the means to age up, but was having too much fun being a child again.
** In "Jake the Dad", Jake and Lady's offspring were born then became old enough to take care of themselves, going back to the status quo with Jake living with Finn again.
* Occurs to Lloyd in ''WesternAnimation/{{Ninjago}}'' in the end of the episode "Child's Play" as a result of using Tomorrow's Tea to turn the Grundle back into bones. This physically ages him from a kid into a young adult, prompting the final battle with his father to draw closer. Curiously, WordOfGod says that he is still a child mentally, though certain events afterwards have caused him to mature at a quicker pace.
* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode "[[Recap/MyLittlePonyFriendshipIsMagicS2E10SecretOfMyExcess Secret of My Excess]]", excessive greed causes Spike (a baby dragon) to grow into a huge adult dragon, [[TheMindIsAPlaythingOfTheBody losing his mind in the process]]. When he finally manages to snap out of it, he returns to his young form again. (Equestrian dragons sneer at your conservation of mass.)
* For the first three seasons of ''WesternAnimation/AvengersAssemble'', ComicBook/TheFalcon was a [[YoungerAndHipper teenaged version of himself]]. However, season 4 opened with the Avengers being scattered through time and space and unlike the others, when ComicBook/TheWasp and ComicBook/TheVision found Sam in a bad future, he'd aged into an adult and traded his classic!Falcon appearance for one akin to his ''Ultimate'' and ''MCU'' ones.