History Main / PlotRelevantAgeUp

''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, seven years have passed, making her 18 years old while everyone else hasn't aged]].

** 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.

** [[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.

** 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).

** While the PhantomZone normally suspends aging, Comicbook/{{Superman}}'s son Chris emerges from its imprisonment as a teenager.

** 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.

* Right before the ''VideoGame/SonicAdventure'' arc of the [[ComicBook/ArchieComicsSonicTheHedgehog 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.

* 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.

* ''Series/{{Angel}}''

* In ''Super Marisa Land'' (A ''Franchise/TouhouProject'' version of ''VideoGame/SuperMarioBros1''), Marisa starts as a toddler but ages up and down depending on how many power ups she has.

* 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.]]

[[folder:Web Comics]]

* ''VideoGame/XenobladeChronicles2'' zig-zags this with its own RobotGirl, Poppi. Her initial Poppi α form appears as a preteen 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.

* ''VideoGame/XenobladeChronicles2'' zig-zags this with its own RobotGirl, Poppi. Her initial Poppi α form appears as a preteen 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

** ''Series/ResshaSentaiToqger'' reveals mid series this actually happened to [[spoiler:the Toqgers themselves]] as they were kids forcibly grown into adults to better combat their enemies.

* ''Manga/MahouSenseiNegima'' has pills that allow one to increase or decrease your age at will. They see quite a lot of use.

* ''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.

* 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 ''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.

* ''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]].

* In ''Fanfic/{{Patient}}''. Dorothy is aged up to seventeen so that she can [[spoiler:have a romantic relationship with Ozma.]]

* 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 ''Fanfic/EvaSessionsSomeplaceVastAndDry'', Kaworu Nagisa is deliberately engineered [[spoiler:by SEELE scientists]] to be physically ten years old in a span of six months, as [[spoiler:Lorenz Kihl]] intends for him to be around the same age as Rei, Shinji and Asuka.

* ''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.

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

* 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.

[[folder:Anime and Manga]]

[[folder:Fanfic]]

* In ''FanFic/TheEndOfEnds'', [[spoiler:Beast Boy undergoes one after being possessed by the Dark Prognosticus]].

[[folder:Films -- Animated]]

** There was also the episode where Jack O'Neill was aged to geezer status... by a nanotech STD, no less!

* ''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.

[[folder:Webcomics]]
* ''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.]]

* 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.

* [[spoiler: Ranu]] from ''One Question''.

[[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]]

!Examples:

* Hotaru in the final season of ''Manga/SailorMoon'', after suffering a [[FountainOfYouth plot-relevant age-]]''[[FountainOfYouth down]]'' more than a season before.

* 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.

* Isabelle in ''Series/TheFortyFourHundred'', later doing the reverse and temporarily de-aging for plot relevant reasons.

* 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.