History Main / PlotRelevantAgeUp

** 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.

** 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.

* 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.

** 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]]...

* This happens to Billy in the ''Series/PowerRangersZeo'' two-parter 'Ranger of Two Worlds' due to a RealLifeWritesThePlot scenario because his actor, Creator/DavidYost, had left the show during the 'King For a Day' two-parter due to what Yost claims was homophobic treatment of him due to being a gay man in the mid-1990s. Like with Austin St. John, Thuy Trang, and Walter Jones in season 2 of ''Series/MightyMorphinPowerRangers', the producers had to come up with an explanation as to why Billy was no longer there due to David Yost's quitting before a proper farewell arc could be written like they'd done for Kimberly the previous season. It is hard to say if he would have been given the 'leaving for/staying on Aquitar' general plotline if he'd stayed and been written off with everyone else in ''Series/PowerRangersTurbo''; a query of fans on the ''Franchise/PowerRangers'' subreddit seems to indicate that he may have been sent elsewhere on Earth instead of off-world like he is in Zeo-like going off to MIT or another big tech or science-heavy college.

** In season 3 when Angel's son Connor was born, kidnapped and carried off into another dimension where time moves faster, he comes back as a 16 year old. His kidnapper counts too, leaving Earth as an adult and a relentless vampire hunter, only to come back as a feeble old man.

** 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.

* Both the Powerpuff Girls and the Rowdyruff Boys undergo this in [[https://www.fanfiction.net/s/13589147/1/Abandon-All-Hope-Embrace-All-Chaos Abandon All Hope, Embrace All Chaos]] with the Emperor training them to become his elite warriors against Chaos. Deconstructed as several characters feel like the six's childhoods have been stolen from them for the sake of a war.

** [[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.

* 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.

* Marvel really has a lot of these:

** 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]]''.

** 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]].]]

* 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.

* 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.

** In ''Series/{{StarTrekPicard}}'', Guinan appears significantly aged from her last appearance despite her species' extremely long lifespans, explaining that El-Aurians have the ability to control their aging process and she opted to age alongside humans because humans get weirded out by someone who doesn't age, while Q shows up looking the same as he did the last time he made an appearance only to see how much Picard has aged and snaps his fingers to appear older to mock Picard.

* 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.]]

** ''ComicBook/BrianMichaelBendisSuperman'' has [[ComicBook/{{Superboy}} Jonathan Kent]] aged up from 10 to 17 despite only being gone from Earth for only three weeks.

** 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.

* 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]].

* 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.

* 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 ''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.

* 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.

* ''VideoGame/XenobladeChronicles2'' zig-zags this with its own RobotGirl, Poppi. Her initial Poppi α form appears as a young girl. A bit further into the game, she is upgraded to Poppi QT, resembling a teenager, and a late-game sidequest unlocks Poppi QTπ, an adult. However, she can switch freely between all three forms, and mostly stays as Poppi α in cutscenes.
* 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.]]

** ComicBook/NormanOsborn artificially aged his twin children by Gwen Stacy so that currently they are the same age-group as their late mother.

* In the Literature/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.

** Duela Dent, "The Harlequin", was a '70s ComicVook/TeenTitans 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.

* Sari from ''WesternAnimation/TransformersAnimated'' in season 3.

** 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.

''Manga/DrStone'': During the South America arc, [[spoiler:the heroes are forced to cause a second mass petrification event, [[TakenForGranite turning everyone on Earth into stone]]. Suika, an 11-year-old girl, is the only one affected by the automated revival fluid delivery system that was prepared beforehand, and by the time she's managed to make more revival fluid, several years have passed, making her a teenager while everyone else hasn't aged physically]].