Kiri: But how did he completely become a child?!
: Ah, yeah. All the previous versions of the drug were incomplete. I finally made one that can revert a person to a child, in body and mind.
Some form of Applied Phlebotinum
results in one or more main characters regressing to an earlier age. It may be the result of a freak accident
, a plot on the part of the bad guys to incapacitate our heroes, or done on purpose so the characters can relive their childhood (at least temporarily). Always central to the plot of a Baby Morph Episode
, which is Exactly What It Says on the Tin
For some reason this plot is often used in Fan Fic
, where it's called a De-Aging story. Often combined with Raise Him Right This Time
When it's an actual fountain or similar artifact that exists to restore youth, it's a subtrope of Immortality
. These will of course be sought out by Immortality Seekers
. A downside to this version of the trope is that the fountain is usually stationary and often in a remote region, forcing the newfound immortal to permanently stay close to it
or at least return regularly, and to keep it a secret from others due to Immortality Immorality
When someone dies in his rejuvenated state, expect him to turn back old
When a Fountain of Youth effect doesn't get reversed and the younger actor replaces the older one in the cast for good, it's also an example of The Nth Doctor
It's common for characters to overdo it in stories involving this trope, often winding up as babies, or possibly even regressing out of existence entirely. This may or may not be permanent, but if the character in question was a bad guy, expect it to be permanent
; well, at least, until they grow back up the old-fashioned way. If the character's clothes don't change with them in this event (and it's shown onscreen), it's likely to cause Shapeshifting Excludes Clothing
. If the event is offscreen and thus a surprise to the audience or one or more characters, Empty Piles of Clothing
results. The Trope Namer
was the mythical Fountain Of Youth that Ponce de Leon searched most of Florida to try and find.
Contrast with Overnight Age-Up
and Plot-Relevant Age-Up
. Compare Really 700 Years Old
and Merlin Sickness
. See also Healing Spring
open/close all folders
- In this advertisement, a young man continues regressing from what may be a high-schooler, all the way down to pre-schooler.
- In a commercial for Nickelodeon in the late 80s, a scientist is trying out a youth potion to make himself a kid again so he can watch "Kids only weekend". But when he drinks it, he turns into a baby which the announcer says "Sorry babies are too young to watch "Kids only weekend"
- There were a couple commercials for the candy Baby Bottle Pop that featured this trope.
- Whenever kids were eating the candy their heads became that of a baby.
- In one, teens at a dance are bored and eat the candy and anyone who ate one is turned into a cartoon baby.
- In an ad for the PS2, we are shown the aftermath of this. In a nursing home, we see empty halls with discarded clothes with no one in sight. A clock is shown moving backwards and then we see naked babies crawling around.
- In a commercial for Bojangles, an old man shows off his Bojangles box. An old woman isn't impressed and drinks a water fountain to become young again and says "I found the water fountain of youth". We see the man again and he's not impressed. We then see the woman has turned into a girl around 13 and she walks away.
- In a commercial for Johnson and Johnson baby shampoo, we see a woman smiling at the camera and bubbles covering the screen. Everytime this happens she becomes younger from adult to pre teen to child and then to baby.
- A long-running series of commercials on American television for Frosted Mini-Wheats cereal had various adults stating to the camera their "serious adult side" approves of the cereal's nutritional value. Then they'd suddenly become children in oversized clothes and continue explaining, in the same voice, the "kid in them" enjoys the frosted sweetness. Sometimes they'd reverse the bit, with a child becoming an adult.
- There was a commercial for some sort of body wash where football players showering after a game using the product transformed (off-camera) into infants.
Anime & Manga
- Happened in Sket Dance:
- The first time was with Bossun after accidentally drinking Chuu-san's youth potion, mistaking it for a bottle of cola. Himeko absolutely flips over him.
- The second time was with Himeko and Momoka, several chapters later, at the same time, with the same bottle of cola. Suffice to say, Bossun had a swell time looking after them.
- In the anime, two girls from the student council drink it on purpose, because "life is an adventure". Needless to say, it makes things even harder. In both versions, when the rejuvenated girls drink the antidote, they get ten years older than normal. And of course, by the time the next episode starts,they're back to their normal ages again.
- Happened for the third time in Chapter 239, with Tsubaki. Except this time he reverted both in physical and mental state. Everyone, including Bossun and Daisy, gushes over how cute he is.
- Because Heaven's computer crashed, this happened to Urd for about two chapters in the Ah! My Goddess manga (and one episode of the 2005 animé), with the reverse happening for youngest sister Skuld. Fortunately, she was able to get an interesting advantage out of it.
- Episode 9 of Keroro Gunsou features mother Aki Hinata getting turned into a teenager by Kururu's newest invention. In a later episode, the same gun turns Fuyuki into a kindergardener. even later, Natsumi, Keroro, Giroro, and Kururu also get zapped by this gun. In one episode, the entire planet gets zapped by this gun, setting time back by about twenty years.
- Sailor Moon has several examples. In the end of the third season (Sailor Moon S), Hotaru, after sacrificing herself to save the world, is brought back as an infant with no memories of her previous life. In the fourth season (Sailor Moon SuperS), PallaPalla casts a spell on Usagi and Chibiusa that briefly exchange their ages for one episode - causing havoc as Chibiusa, having fulfilled her dream of becoming a beautiful adult, is now unable to summon Pegasus and Sailor Moon can't defeat the Lemures without him. In the beginning of the fifth season (Sailor Moon Stars), Hotaru rapidly grows back as her memories return, and the previous season's Big Bad, Nehellenia, is returned to childhood to allow her to relive her life and avoid the mistakes that turned her into a villain in the first place.
- In the manga, PallaPalla swaps Usagi and Chibiusa's in the first chapter of the Dream arc, which is actually done to depower the two of them. They eventually overcome it and transform into their proper bodies using their henshin phrases. Later in the same arc, Zirconia depowers both Sailor Moon and Tuxedo Mask in the same manner, turning them into six year olds and preventing them from accessing their magic. Pegasus reverses it by transporting them to Elysion, which has enough purifying power to break the spell.
- The Nehellenia story is reused in Mermaid Melody Pichi Pichi Pitch, but with Michal, the Ill Girl and not-quite-villain.
- Ranma ½:
- Lukkosai, who tried to use the spring of drowned child to regain his youth, but instead just goes from way too old to way too young (both about the same size). He then uses this form to get revenge on Happo while pretending to be his own grandson.
- Another story involved mushrooms that change your age in years to their length in centimeters. Ryoga eats a short one and then makes Ranma eat one. They spend most of the chapter trying to change back by growing mushrooms big enough to return them to their normal ages, while constantly sabotaging each others' mushrooms.
- And yet another story from the manga has Happosai feeling the pangs of old age. He finds out about a potion that will restore his youth, but first he needs the tears of a beast that is both male and female. The next thing you know, tear gas and onions fly liberally around Ranma. When he finally succeeds (by poking a pressure point that makes Ranma gush out tears like a firehose) he trips, and splashes the tears all over the floor. Kasumi wipes them up with a rag, but since it had been used to clean up soy sauce, the resulting potion regresses Happosai's mind to that of a baby.
- Alessi in Part 3 of JoJo's Bizarre Adventure does this to opponents with his Stand, Sethan. The longer you stand in his shadow (through which Sethan manifests), the younger you get, including your Stand getting weaker (and that's only if you developed your stand at a young age). Unfortunately for Alessi, when he tries this on Jotaro, he learns the hard way Jotaro was Badass even at age seven.
- It turns even worse out for him in the game when he used it on Joseph. Due to Joseph already being very old, it only regressed him into his late teens. Unfortunately for Alessi, that was the age when Joseph was at his prime and beat the Pillar Men, who were FAR stronger than any Stand users in Part 3. Joseph maintains his youth for a while after beating Alessi, but it eventually wears off and he returns to normal, wishing it could've been permanent.
- In the manga, a young woman was reverted to a fetus when she had the bad luck of standing in Alessi's shadow for ten seconds (Yeah, it's that fast). Fortunately, she is saved.
- In Koi Koi 7, after Yayoi Asuka (the one with the eyepatch) goes berserk, she's rebooted in one of Otome's spare bodies as a cute young girl named Gantai-chan who doesn't remember much of what happened before.
- In the Dark Tournament arc of YuYu Hakusho, an enemy uses a special mist meant to de-age its victims past the point of conception. Unfortunately for him, his target was Kurama, and once his human body went into non-existence, his previous incarnation - full-powered demon Yokokurama - manifested and quickly dispatched him.
- Rosario + Vampire has an example of this one. Yukari and Kokoa, after realizing that they're not being taken seriously due to their age, use some of Yukari's age-up pills for a temporary change. When the pills wear off, Kokoa finds herself younger than before. She finds herself in trouble shortly thereafter, only to be saved by the entire Unwanted Harem (sans Tsukune) turned into children along with her. Much cuteness and butt-kicking ensues.
- Dragon Ball:
- King Piccolo and Lord Slug used the titular MacGuffin to restore their youth, putting their power at prime. Roshi and his sister Baba actually drank from a Fountain of Youth, which, rather than restore their youth, fixed them at that age, unable to die from old age.
- Goku turning into a child is part of the whole concept of Dragon Ball GT.
- The concept was used again in the 2013 film Dragon Ball Z: Battle of Gods where the Pilaf Gang were transformed into children off screen.
- Who can ever forget APTX-4869 in Detective Conan? It regressed Shinichi Kudo and Shiho Miyano's body by around ten years, causing two Teen Geniuses to live in first graders' bodies. On the other hand, APTX-4869 is intended to be a poison and is generally successful.
- In Black Cat, Creed (Doctor did in the anime instead) accidentally shoots Train with a Lucifer bullet, causing Train to transform back into a child (around 8 years old). It only lasts one episode (or a few chapters).
- In Mahou Sensei Negima!, Weasel Mascot Chamo produces a jar of magical (and illegal) candy that can produce this effect as a sort of illusion (red candy for older, blue for this) both for fun on the part of the girls and as a Strangely Effective Disguise when they become wanted people. It's been implied that The Mind Is a Plaything of the Body, resulting in the aged-down characters acting with far lower maturity than usual, though they retain their intelligence. This doesn't work both ways, so their adult forms behave like giddy teens.
- Black Lagoon: a non-canon omake has the main cast regress to adolescence and, in Balalaika's case, beyond. For the record, loli-Balalaika is the cutest thing ever.
- The most shocking ones are Yolanda (the old nun), who was a delicious and hot cake at 29 and Balalaika's underling Boris, who was Bishounen to the max.
- An Ace Attorney doujinshi features Edgeworth turning into a cute little boy thanks to a Fey family recipe gone awry. Given that he was just about to take Wright's place in a case, Hilarity Ensues.
- Ichinensei Ni Nacchattara has this as part of its core concept, with main character Iori going from high school to elementary school, and getting gender-bent in the process. However, he retains his original personality, and he's not happy about becoming an elementary school girl.
- Later on, almost the entire town regresses into kids, and judging from the Empty Piles of Clothing littered all around, possibly even beyond (It's pretty hard to tell).
- Doraemon's Non-Serial Movie: Nobita in the Wan-Nyan Spacetime Odyssey follows the story of Eiji, an anthropomorphic dog who travels across time to find his ex-owner, Nobita, but the unstable time tunnel causes him to warp into another place and ended up being turned back into an infant. This also happens later with Gian and Suneo, but only temporary.
- One Piece:
- The supernova Jewelry Bonney's Devil Fruit allows her to change the age of whoever she wants. Guess what she usually does when enemies get in her way?
- From the twelvth movie One Piece Film: Z, Ain's Modo Modo no Mi powers allow her to rejuvenate her opponents. Unlike Bonney's powers, however, it works on inanimate objects too, and it can only work backwards, whereas Bonney can also age her opponents. Nami, Chopper, Robin and Brook all got hit by it, regressing the former two into children, Robin into a teenager, and... not altering Brook's physical appearance at all, since he's a skeleton.
- Nightin from the 3D2Y TV special is an ugly and short 80-year old woman, but by using medicine of her own conception, she can rejuvenate herself into a much more beautiful young woman.
- One of the first monsters in Devil & Devil is a huge tentacled... thing, that sucks time out of people. It turned a young woman and two young girls into babies, and a third young girl into a child, but they all turned back to normal when it got its ass handed to it by Sword.
- In Bleach, Nel Tu originally had the appearance of a late teenager/young woman, but after being attacked by her rival Nnoitra, she ended up reverting into a small child.
- The Korean manhwa series Horror Collector depicts Elizabeth Bathory as a young adult who frequently reverts back to her teenage self through her regular Blood Baths.
- In Stitch!, Babyfier (a creature that can turn people into babies) makes 3 appearances.
- In "Rivals stick Together" Babyfier is unleashed at a school turning most of the students and adults into babies.
- In another episode Babyfier turns the main character and her friends into toddlers.
- In the third episode, Babyfier is now good and turns a couple of the villians into babies.
- This is basically the point of Mayonaka Lolita : Mishiru Kachiwabara, a very beautiful young girl, is given a strange juice by a male student (Aoi Makimura) she had never seen before. As it turns out, that juice is a rejuvenation potion, that their teacher had mistakenly given to Aoi as juice, and Mishiru regresses into a little girl. Her teacher tells her the only way to get back to normal is to kiss the person she loves, but tough luck, Mishiru doesn't love anybody. Because she can't go back home as a child, Aoi brings her to his house and allows her to stay there. They eventually do kiss at the end of the first chapter, and Michiru turns back to normal... before turning into a child again.
- In the episode "Ultra Hot Kid's Meal" of Galaxy Angel A, the Angel Brigade mistakes a Lost Technology for a box of uirō and turn into children, toddlers, and in Milfeulle's case, a baby. Because The Mind Is a Plaything of the Body, the girls gave the twins a pretty hard time looking after them.
- This is part of the premise of Asatte no Houkou : when they both happen to meet at the same time in front of a wishing stone, a young woman transforms into a little girl, and vice-versa. It is implied they change back at the end of the series.
- In an episode of Akazukin Chacha, the main trio is tricked by some bad guys into drinking rejuvenation potion, and turn back into babies. Seravy and Dorothy are also reverted to kids. Of course, they all turn back at the end.
- In Gakkou Kaidan (A Yousuke Takahashi manga that's unrelated to the anime Ghost Stories), a Villainous Harlequin transforms a young girl into a baby and a young female teacher into a kid. Both turn back to normal when the harlequin gets his ass kicked.
- Marvelous Melmo: Nine year-old Melmo's magical pills allow her to change her age as she pleases. Depending on the situation, she can change herself into a baby, a nineteen-year old girl, or even regress back into a fetus in order to be reborn as an animal, should she need to.
- In a chapter of the Japan-exclusive Hyperdimension Neptunia manga (Part of said chapter can be seen here◊), this happens to Nepgear, Rom and Ram, and Uni, who regress into babies after eating some pills that Neptune accidentally gave them. Of course, Neptune has a pretty hard time looking after them, until Gust gave her the pills to change the girls back.
- In an episode of Brigadoon: Marin and Melan, Marine eats some weird chocolate that causes her to start hallucinating. Among other things, she imagines herself growing into a young adult, then regressing into a baby.
- A plot used multiple times in Anpanman. A couple episodes have had Baikinman make a spray that changes anyone (or anything) in contact with it into babies (with objects becoming earlier stages, like a tree becoming a sapling). He does this as ways to make Anpanman weak against him, but it always gets foiled in the end. One theatrical short showed there's an entire lake, one side red, which turns the victim into a baby, the other side blue, which returns them to normal. Another theatrical short had Hiyariko, an aspiring scientist, create a potion to make Baikinman stronger...only to turn him into a baby. When he runs off, she makes what she thinks is an antidote, and sprays it all around the town...only to turn the entire town into babies. Thankfully, this potion was only temporary, and everyone returned to normal eventually on their own.
- Jack Vessalius has this happen to him in Pandora Hearts as a result of being rejected by the Abyss. His soul was shattered to pieces during the fight between Alice, Alyss and the Core of the Abyss. As a result, he kept on de-aging in a cycle:every time he reached the age of twenty-five, he will become younger and younger. Jack's mind has disappeared almost entirely due to a result, leaving only B-rabbit! Oz in place of him, who, according to the manga: "Had lost all of his memories and his powers and fell in a deep slumber." It is unknown at this point if it will happen to Oz since he was in the Abyss for ten years, making him twenty-five, but considering the fact that he himself is a chain, it may or may not happen to him.
- The World God Only Knows:
- In the "Heart of Jupiter" arc, Keima is sent back to the past via Mental Time Travel and given a mission to save a cute but emotionless and mysterious young girl from commiting suicide. If she gets overtaken by despair, she starts getting younger until she's transformed into a baby, which triggers a Reset Button that sends Keima back to the start of the mission. However, he can stop her from getting younger by kissing her before she turns into a baby.
- The main manga also had a three-chapter spinoff called Magical Star Kanon 100%, focused on, as the name implies, Kanon Nakagawa. In it, she is turned into a child by a Runaway Spirit and has to hide her identity and find a way to get back to her true age. The OVA version even has Elsie turn back into a child.
- In Death Note, Shinigami can steal the lifespans of humans by writing their names in Death Notes, which kills the human. Humans who use the Death Notes don't get the lifespans of their victims but if a Shinigami uses their Death Note to save a human's life, the Shinigami dies and the human gets all of their lifespan.
- In an episode of Magical Project S, this happens to Sasami as a after-effect of an aging potion. The aging initially works well, but after Sasami returns to her normal age, she turns into a baby overnight.
- In episode 3 Mamotte Lollipop, Rokka temporarily transforms Nina into a baby out of jealousy.
- In Fairy Tail, a villain in the Taiyou Village arc named Doriate uses magic that severely weakens people's magical and physical power, and has the added effect of turning them into children. Erza, Natsu and Gray are hit by it, but turned back to normal later. Also, everyone present is regressed briefly in chapter 350 (Including Wendy, who becomes an even younger child).
- Some chapters/episodes of To Love-Ru and the To-Love-Ru Darkness OVA feature a creature named the "skunk of youth", which regresses some of the main characters, among others, into kids.
- In Magical Girl Lyrical Nanoha ViVid, one of Fabian's devils has a spell that de-ages the target and successfully enchants Sieglinde with it to incapacitate her.
- Horiffically deconstructed in Franken Fran: The villain from the "Eternal Youth" chapter is an old woman who wishes to regain her youth, but kills many doctors and steals their researches to do so. When comes Fran's turn, it comes back to bite her really hard: At first, it works and she becomes a young woman again, but because Fran's research was still very experimental, she soon afterwards turns into a pulsating mess of cancer cells.
- Amber from Darker Than Black has this as her remuneration; she regresses in age every time that she uses her powers. In the end, she ends up fading into nothingness altogether due to overuse.
- MÄR: Much like the Darker Than Black example mentioned above, this is what happens to Loco every time she uses her powers. By the time she's introduced, she looks like a child of around 11 or 12, despite actually being 32 years old. She eventually turns back into a baby after a Heroic Sacrifice, and is being taken care of by Chaton and Alan near the end of the series.
- In an episode of Smile Precure, the main heroines are turned into kids, and need to find a way to turn back.
- Magic: The Gathering:
- Jhoira from one storyline was exposed to timewarped water that dramatically extended her lifespan after a horrible accident at Urza's Academy. By the events of the Time Spiral storyline,she is over 1000 years old but looks like a 19-year-old—an almost literal fountain of youth.
- Magic has had the literal card Fountain of Youth for the longest time. Which is how Jodah, Archmage Eternal of the Academy of the Unseen, came to be several thousand years old by the time he met Jhoira.
- Yu-Gi-Oh!: Avance becomes younger when donning one of the Nekroz armor note . He also does this as Sword Saint of the Nekroz - Sephira Saber.
- In the first issue of Super Hero Squad (based off the cartoon of the same name), Dr. Doom plans to use a time machine to go back in time to retrieve the fractal shards. The squadies intervine and the machine malfuctions, turning them all (except for Reptil) into babies (Redwing turns into an egg). Now chaos ensues as the babyfied heroes and villains fight.
- This was a favorite tactic of the extradimensional media mogul Mojo in the Claremont-era X-Men comics. Since time passes slowly in comic book universes, this is usually not an issue, as most characters' backstories aren't tied to a specific event. A notable exception is Magneto, a holocaust survivor canonically born in the 1920s. To get around this, he was reduced to infancy and then aged back to adulthood sometime in the 80s, putting his age firmly back in the traditional comic book "fucked if I know" category. Magneto has naturally gray hair, and was in good physical condition for a man of his age. Different artists either draw him as a physically fit older man or a physically fit young man with gray hair.
- The DCU Fifth Week Event Sins of Youth combined Fountain Of Youth and Overnight Age-Up, with a combination of Chaos Magic and an "aging ray" turning all the teenage heroes into adults and all the adult heroes into kids.
- Happens twice from two different sources in Astérix and Obelix All at Sea: First Obelix gets de-aged as an after effect of drinking the Magic Potion, then our heroes discover the remnant of Atlantis, where everyone is a child (and happy from it) after having drunk from an actual Fountain Of Youth.
- Three of The Smurfs were child-ized when Peyo felt he needed a few child characters. There was no cure for the miniaturization, in a rare case where this trope isn't reset. In fact, they didn't mind their new situation.
- However, there were two episodes in the cartoon show where the Smurfs did find a literal fountain of youth that de-aged Papa Smurf and Grandpa Smurf in different situations, both of whom were later restored to their actual ages.
- And there's "Smurf Van Winkle", where the other Smurfs try to pull a Rip Van Winkle on Lazy to make him think he has slept for a few centuries while his fellow Smurfs have aged incredibly. Lazy works on a potion to bring them back to the same physical age he is, but the whole thing was revealed to be a ruse when they were all de-aged into Smurflings.
- Ra's Al-Ghul's Lazarus pits. While not -exactly- the same thing, the pits are used at one point in Batman Beyond to restore elderly Bruce Wayne back down to his 40s (as part of a Ra's plot to put his mind into Bruce's body).
- There was another story from the 60s in which Batman is turned into a toddler but he retains his intelligence and strength. So basically the villains who plotted to do this, all they really did was make him a more difficult target
- Judge Dredd:
- Dredd a rare example of a comic book character who ages in real time, had a couple of decades taken off in the 1990s after being exiled from the city and getting his face burnt off.
- Within the comic, there's stookie capsules, which dramatically slow the ageing process in humans. Since producing them requires the slaughter of a peaceful and harmless alien species, they are highly illegal.
- In The Incredible Hercules, Zeus gets reverted back to childhood, both physically and mentally, by drinking from the river Lethe.
- In a "Gnuff" story in the Furry series Critters, the main characters are stranded on an island divided by a steep mountain range where one side has water that makes you younger and the other has potatoes that make older. So, if you're living off the land on that island, you need to balance these foodstuffs to maintain your true age. Unfortunately, the one pass through the mountain range gets blocked and the characters on both sides realize that they are in terrible danger of eventually overbalancing on one of the materials and dying or disappearing as a result unless they can each get to the other side. note
- One Popeye adventure involved a search for the Pool of Youth. While the pool doesn't actually make you physically younger, it extends your lifespan indefinitely, and gives you a younger mentality — a man claimed to be over 200, but felt he was 6. The Pool was guarded by the Sea Hag's sister, and her army of cavemen.
- Mina Murray and Alan Quartermain search for the Fire of Eternal Life in The League of Extraordinary Gentlemen New Traveller's Almanac. They fail to find it, and Alan dies on the trip. After an indecently short period of time, Mina hooks up with Alan Quartermain Jr. Really, that's what happened. It's in the Almanac.
- In The DCU, the Fountain of Youth is what gave Detective Chimp the ability to speak to other animals and stopped his aging. It's either magical, radioactive or alien nanotechnology.
- In the story "A-Corny Story", in issue #28 of Tales from the Crypt, this guy who was fired by his late boss' son for being "too old" sent him a tree from Haiti that was supposed to prevent old age. It started out as this hideously gnarled specimen that kept growing younger, and its new owner started doing the same. On the day the tree finally de-aged into a seed, the guy de-aged into a sperm cell or something and vanished.
- Spirou and Fantasio had the main characters search for the actual fountain. After the mission ended in failure with the water losing its power permanently, Spirou winks and says Do you really think we need that?
- Several Disney comics featured either the fountain itself, or characters getting younger. For an example, in the story "History re-Petes itself", Pete's attempt to turn Mickey into a baby backfires, resulting in Mickey trying to Raise Him Right This Time. Over the two weeks Pete grows up rapidly, Mickey and his friends attempt to make him into a good guy, but infortunately, as you might have guessed from the title, it fails and Pete remains bad.
- The Franco-Belgian comic Les Petits Hommes features a story named "Miss Persil". It centers around a young girl who has the mind and personality of a five-year old, due to entering a coma at that age and miraculously waking up recently. It obviously causes a lot of problems, especially considering her parents intend to place her in a school in the "big world", but the Doctor finds a way to get around that by making her drink an elixir of youth to rejuvenate her, so that her body will match her mind. It works well, but Hilarity Ensues when she actually takes the elixir with her.
- One Batman comic features a group of mad scientist villains who turn Batman into a toddler in order to make him more vulnerable. Yet he still keeps his adult mind, memories, and strength and skills. So pretty much all they did was make him a harder target.
- The fountain appears in the Marvel Universe in both the original Man-Thing series as well as the first She-Hulk series, with a small village of people from the Conquistador days living there. Drinking the water however isn't what leaves one immortal but regularly bathing in it (drinking it will leave one a shriveled, red-skinned immortal). She-Hulk eventually convinces them to destroy the titular fountain as they've also grown apathetic (when several villagers are killed by wild beasts they ignore it) as strong emotions break the immortality causing one to begin to age again since they've given up living by what they've sacrificed for immortality.
- Several 1950s Wesinger-era Superman Family comics stories feature characters temporarily regressed to infancy via various means, usually retaining their adult minds. 'Superman', 'Lois Lane', and 'Jimmy Olsen' were among those regressed at one time or another.
- A Golden Age Captain Marvel Junior story had the young hero battling his nemesis Sivana Junior, who'd discovered The Fountain of Youth and was using it to regress wealthy businessmen to children he could bully. Captain Marvel Junior is temporarily regressed as well, but finds the cure and turns the tables on the villain.
- Happens to Giles in the Buffy the Vampire Slayer spinoff Angel and Faith, the result of a resurrection spell that doesn't go quite according to plan. The twist is he still has all his adult memories, but they're now at the mercy of a pubescent, hormone-addled body.
- In Kyon Big Damn Hero, Nagato provides this function for Kyon, Mikuru, and Kanae. Otherwise the Year Inside, Hour Outside training would make them age by over a year every night.
- In With Strings Attached, the four awaken to find themselves on another planet and 16 years younger—their 1980 minds in 1964-age bodies. They think they've been geuninely de-aged, but at the end they find out they're in cloned bodies. The Fans wanted to give them fresh new bodies as payment for going through all the hassle on the planet; they were going to age the bodies, give them appropriate scars, etc., after the adventure was over. However, things got out of hand, and a whole lot of magic got dumped on the clone bodies. Because the Earth universe has no magic, this meant that the four had to be transferred back to their original bodies in order to return home.
- The Youth Restoration Spell from My Little Alicorn reverts any pony it's used on to any prior age for two hours, after which they are supposed to turn back to normal. Naturally, Luna thought it would be a great idea to use it on Celestia as a prank, not realizing that it works a little bit differently on Alicorns. Hilarity Ensues.
- The Star Trek: The Original Series fics Insontis and Insontis II detail this happening to Kirk and Spock, respectively. Hilarity Ensues.
- The Facing The Future Series features a story where Danny and Sam revert to five year olds in homage to a Star Trek: The Next Generation episode entitled "Rascals".
- Happens to Data in "Small Packages by RebeccaOTool, via an unoccupied android body left by his late father. Played for laughs. At first.
- Loki turns the Avengers and himself accidentally into toddlers in this story. Unlike most others in this genre, the children retain their memories and powers, leading to more than the usual Badly Battered Babysitter plot.
- Loki changes himself into a four year old semi-voluntarily, but due to exhaustion he can't change back. He retains his memories and personality, and decides to use his new situation...
- Getting Back on Your Hooves: This is what Poison Joke does to Trixie. Interestingly, it also affects her mentally (and since she didn't have a happy childhood...)
- The Manehattanverse story "Fillie's Play" focuses on this, as a magical mishap during one of Twilight's experiments turns her and the rest of the Manehattan 6 back into fillies. And has the opposite effect on Orange Sherbet's daughter, Tangerine.
- Twilight accidentally turns herself into a filly in Diaries of a Madman, after one of her spells backfires.
- In Pony POV Series, when Princess Gaia tries to take over the world and turn it into a utopia, she de-ages the citizens into foals, thinking they would be happier that way. Everyone was horrified and feared that the pregnant mothers' unborn children had been erased. Fortunately, they weren't, and once the mothers were returned to normal, their pregnant bellies returned.
Films — Animated
- In Tangled, originally it was the magic flower that Mother Gothel used to keep her young. But after the Queen drank the flower and gave birth to Rapunzel, Gothel got her Fountain Of Youth from Rapunzel's hair.
- In Yellow Submarine, The Beatles and Old Fred regress to childhood and young adulthood respectively after travelling backwards through the Sea of Time. When they end up reversing the change, they end up reversing it a bit too much.
Films — Live-Action
- The MacGuffin weapon of the Big Bad in Sky High did exactly this.
- The titular character in The Curious Case of Benjamin Button has a similar problem: he ages backwards. He is born as an old man, and dies of old age as an infant.
- The Fountain involves a story within a story about a Conquistador's quest for the Tree of Life, which can theoretically grant immortality. Outside the frame, there is a tree which essentially de-ages a cancer-ridden monkey and presumably grants immortality to the main character.
- This is the point of 17 Again.
- Also the plot of the very early made-for-tv Keanu Reeves movie Young Again, from which 17 Again seems to be heavily drawn. 17 Again is practically an unoffical(?) remake of the film.
- The Sequel Hook at the end of Pirates of the Caribbean: At World's End ends with (the immortality-seeking) Jack unfolding a map to something called the "Agua De Vida". The book that the next movie is based on revolves around the Fountain, so...
- The Fountain in On Stranger Tides is played with. It doesn't make you any younger, but instead adds years to your life. However you need someone to take the years from...
- The MacGuffin in The Nutty Professor 2. Professor Sherman Klump creates a fountain of youth formula which lasts temporarily.
- In The Three Stooges short "All Gummed Up", the boys are druggists who invent a youth serum and give it to their elderly landlord's abused wife. Predictably, she turns into a beautiful young woman. But when the landlord tries it, he turns into a bawling infant.
- In the remake "Bubble Trouble", the landlord turns into a gorilla.
- Beautifully played with in the finale of the IMAX short Cirque Du Soleil Journey Of Man: When The Everyman middle-aged hero accepts the old bowler hat of his youth from a little Vagabond Girl and ducks offscreen so she can put it on him, the voiceover narration explains "Years turned to dust. I was young again." He rises back into frame as an old man but it's clear he's as full of life and joy as he's ever been, having regained his youthful spirit, making this an example of this trope and Overnight Age Up all at once!
- The pool house in the movie Cocoon, by way of Alien Phlebotinum.
- The planet Baku in Star Trek: Insurrection. The fact that it remains unused by the rest of the Federation and is only used by the Baku makes it seem much like a Not So Hidden Elf Village
- Smurf essence becomes this in The Smurfs when Gargamel used it on Odile's mother, which makes Odile want to get her hands on it.
- Early on in the French film Les Visiteurs, a witch forces an old woman to drink one of her potions. This causes her to inflate slightly and rocket through the roof (And judging from the other holes in the roof, she wasn't the first victim), only to fall back in the house a minute later, as a younger woman.
- In Wishmaster 2, one of the burglars who broke into a museum meets the Djinn, who grants him one wish. The burglar, scared out of his wits, wishes he were never born. The poor guy really should have known better than to ask that of a Jackass Genie. The Djinn is all too eager to grant his wish, causing the guy to age backwards until he flat out disappears, only leaving his clothes behind.
- Sur la piste du Marsupilami: A special orchid's juice can be distillated into a youth potion. The Marsupilami being apparently linked to those orchids, the Big Bad is after it. He eventually gets his youth back, plus interest.
- 'The Little Rascals' short Shrimps For A Day involves a wealthy young couple who find a magic lamp and wish themselves into kids so they can play with the Rascals, who are visiting from an orphanage. Naturally, things go horribly wrong, and they get a first-hand view of how badly the orphanage is really run.
- In the last scene, Spanky wishes the mean headmaster into a little kid his own size, and proceeds to give it to him but good.
- In Diana Wynne Jones' House of Many Ways, the grown wizard Howl became the Deliberately Cute Child Twinkle partly as a disguise and partly (he said) because he felt he deserved a better childhood than the one he'd actually had.
- Terry Pratchett did this in The Last Continent, combined with Overnight Age-Up, when the wizards travel to a place (Fourecks), where, due to morphic instability, Ponder Stibbons becomes an eighty-year-old, and the Dean becomes a thirteen-year-old. And then there's Mrs. Whitlow...It wears off within a few minutes.
- And in Eric Ponce da Quirm is an old man who's spent his entire life searching for the Fountain of Youth. Rincewind doesn't quite have the nerve to ask him whether it would have been better to just have a life in the first place. When they later encounter him in Hell, they learn that he did find it, but there's one thing all the legends forgot to mention about the water of the fountain of youth - boil it first.
- K.H. Metzger's Skye Sparkler is all about this. A woman in her thirties designs a little-girl superhero character and subsequently, permanently becomes her.
- In The Thief Lord by Cornelia Funke, there is an example of this trope in the form of the elderly Conte and Contessa, who use a magical merry-go-round to become children again.
- In the Blackcollar books by Timothy Zahn, a drug called Idunine can reverse many of the effects of aging. In fact, taking heavy doses of it is once used to disguise several characters, as they now look much younger.
- In Robert A. Heinlein's Future History series, medical rejuvenation therapy works to reverse the aging process through a variety of techniques, from swapping the body's entire blood supply to cloned tissue transplants. In extreme cases, a human at near-death can be completely rebuilt to look and feel twenty years old again, complete with a fresh brain that's had the memories from the old one copied into it. This plus a program of applied eugenics designed to extend the natural lifespan has resulted in a subrace of near-immortals, of whom Lazarus Long (featured in Time Enough for Love and The Number Of The Beast) is by far the oldest.
- Glory Road, while set in a different continuity than the Future History series, also features medical rejuvenation, known on Center as "Long Life" treatment.
- In Gilded Latten Bones, the King of Karenta is discovered to be shielding a trio of necromancers who have been keeping him and themselves unnaturally young. Unlike most examples, users of this age-reversal effect retain their gray hair, so must wear wigs to suit their youthful bodies.
- The Rapture becomes this for older Christians in the Left Behind book series when they receive their glorified bodies, while for children and teenagers it brings them up to the same age level as the adult believers. At the end of the Millennium, even the longest-lived naturals (who are at that point all believers) are restored to the prime of their youth.
- Willy Wonka invented Wonka-Vite, a invention that makes people younger. It's used in Charlie and the Great Glass Elevator on Charlie's three still-bedridden grandparents. Unfortunately, they don't listen to his instructions and take too many — one pill takes 20 years off, and each takes four pills. That renders two of them babies, and since Grandma Georgina was seventy-eight and thus becomes negative two years old, her spirit winds up in the dreary Minusland. Luckily, Mr. Wonka also created a Rapid Aging counterpart, Vita-Wonk...
- Due to a quirk in their physiology, the Cheela in Dragon's Egg can rejuvenate. Under particular conditions, when their body has been battered enough, it will revert to the plant the Cheela evolved from and heal itself, taking the best part of a lifetimenote than us in the process. Then the plant turns back into a Cheela in its prime. In the sequel, Starquake, this very rare and risky process has been harnessed and rejuvenation machines are in use.
- The carousel in Something Wicked This Way Comes can function as either this or as an Overnight Age-Up, depending on whether it runs backwards or forwards. Carnival co-owner Cooger uses it to go incognito as a preteen boy.
- A literal fountain drives the plot of Dirge for Prester John. It's nothing like what the characters expected it to be, but it does the trick.
- In Tales of Kolmar, lansip leaves and fruit, very difficult to get to and already a potent Panacea, can be distilled into a liquor which can make the drinker younger. There's a tale about an elderly merchant who was found after drinking an overdose, with the body of someone in his twenties. Berys is much more careful with his supply, taking a little at a time and prudently using makeup to make himself still look old, and arrives at midtwenties without dying of it.
- Harry Potter and the Order of the Phoenix: During the battle of the Department of Mysteries a Death Eater's head turns into that of a baby when he falls into a magical clock.
- On one of the unknown islands visited by Máel Dúin and his companions in the medieval Irish Voyage of Máel Dúin, the voyagers observe a giant bird rejuvenating itself by bathing in a magical lake. Diuran the Rhymer tries it too and emerges permanently rejuvenated.
- In Mistborn: The Original Trilogy, The Lord Ruler pulls this off by being both an Allomancer and a Feruchemist. To elaborate, Feruchemists can store youth in the metal atium, which causes them to look and feel older than they really are for a time in exchange for allowing them to look and feel younger than they really are for the same amount of time later on. Allomancers can "burn", or Allomantically metabolize, various metals to gain specific superpowers: tin grants Super Senses, brass allows you to dampen someone's emotions, etc. The Lord Ruler discovered that if you burn Feruchemically charged metal you get back ten times the Feruchemical charge you put in. Effectively, the Lord Ruler had an infinite supply of youth.
Live Action TV
- The Buffy the Vampire Slayer episode "Band Candy", in which all of the adults ingested chocolate bars that had spells inside of them that did not physically de-age the characters, but made them act as they had as teenagers. The episode is filled with hilarious examples of the Scoobies becoming more and more horrified by their parents, teachers, and even the stodgy Giles, as they act in irresponsible and (in the case of Giles) criminal ways.
- Star Trek: The Next Generation:
- The episode "Rascals", in which a transporter malfunction turns Picard, Keiko, Ro and Guinan into children, during which time the Enterprise is captured by hostile aliens. Despite the fact that they clearly keep their adult minds, they still have to save the day using childlike cleverness rather than their usual methods. As children, they would lack the strength and speed to do many of the physical actions an adult could perform.
- The episode "Too Short A Season" has an old Admiral who must negotiate a hostage situation. He seems to have taken a drink from this Fountain as he keeps getting younger. We find out he takes an alien drug that does this too well—-the strain on his body kills him.
- One of the few permanent examples comes from Kamen Rider Den-O which did this out of necessity. The actress who played female lead Hana quit unexpectedly in the middle of the series, but her character was too important to the story to write out. So the producers replaced the twentysomething actress with an eight-year-old. A subplot was added in which Hana was de-aged due to a time anomaly...and stayed that way. In a further subversion, none of the characters, including Hana herself, seemed to have much of a problem with this, and hardly any effort was made to find a cure. After the third movie, the show's star moved on to other projects, and thus this happened to protagonist Ryotaro as well. In this case, however, they simply brought back the actor who played the preteen version of him from the first film. It's given a Hand Wave when he remarks that this sort of thing happens on occasion when you mess around with time travel, which may also explain why there hasn't been a mad scramble for a cure for either him or Hana.
- Mighty Morphin' Power Rangers:
- The Alien Rangers half-season was an extended plot-arc in which all the regular characters were age-regressed to young children.
- This happened in a season 2 episode. In both cases, it seemed to be a strange mix of this and Time Travel- all the high-school-age heroes were now in elementary school, but they had the same teachers and principal. All the characters who were originally from out of town were still there as well.
- A mild example happens in Stargate Atlantis, when Sheppard's tenuous Wraith ally returned the years he had, um, borrowed, plus a bit. Possibly an attempt to balance out the six months he spent in a time dilation field.
- Stargate SG-1:
- The Goa'uld Sarcophagi can greatly extend life as well as healing wounds (but at the cost of negative psychological effects). However, this isn't that important to the Goa'uld, as they can just take another human host anyway. Though as Lord Yu demonstrates Goa'uld symbiotes age and go senile on their own, and without the sarcophogus have a lifespan of about two hundred years.
- This appears to be the case when 15-year-old O'Neill shows up in the episode "Fragile Balance." In actuality, he was an Asgard-designed clone that did not mature properly.
- The Mighty Boosh: In the episode, "Fountain of Youth," Howard and Vince visit Naboo's home planet, Xooberon, in search of their own Fountain of Youth, but the Hitcher is looking for it, too. Hilarity Ensues.
- Doctor Who:
- "The Time Monster" has Sergeant Benton temporally regressed to babyhood by a time-eating monster. He is eventually returned to adulthood, in front of everybody else, stark naked. Hilarity Ensues.
- In "Boom Town," Blon Fel-Fotch Pasameer-Day Slitheen is a member of the Slitheen family of the alien Raxacoricofallapatorian species. In the episode, is it explained that members of the family are raised from infancy to be sociopathic criminals. When Blon is exposed to the Heart of the Tardis, it turns her into an egg; she will be returned to her planet's nurseries, where she will have a chance for a new life.
- "The Lazarus Experiment" episode is about the titular scientist inventing a device that restores cells to a previous state. Being an old man, he tries it on himself first, becoming young. That is until the horrible side effects of the device are discovered. The Master later uses the technology in reverse to make the Doctor old.
- Happened in The Genie From Down Under, where Penelope, after abusing her long-suffering Genie, Bruce, with over 200 wishes in an hour, he intentionally made a wish of hers backfire, turning her into a baby. Oddly though, due to the nature of the wish, nobody seemed to be surprised by her age regression, as though she was supposed to be an infant.
- At the end of the 1998 Merlin series, when the titular character is a Cool Old Guy complete with beard, his last act of magic is to restore the youth of himself and his love, returning them to their younger personas seen years earlier in the story.
- In Sanctuary, all of The Five had unnaturally long lifespans due to the infusion of pure vampire blood with the exception of Watson who was implied to have long life due to a technological device he created (as a result of his increased intelligence due to the aforementioned vampire blood (Aquifer Of Youth?)) Except for Griffin, the Invisible Man.
- The Twilight Zone:
- In episode "A Short Drink From A Certain Fountain" has an old man try to regain his youth to keep up with his trophy wife. His scientist brother has found an anti-aging serum, but it's untested... The serum reduces him to infancy. As his wife is about to walk out, his brother (who now controls the man's estate) stops her, informing her that if she wants to keep one penny of her infant husband's money, she'll have to raise him back to adulthood...
- In the episode "Kick the Can", all but one of the residents of an old-age home became kids again by playing the titular game.
- In the children's series LazyTown it occurs in the episode "Little Sportacus" where Sportacus is de-aged by Robbie Rotten's machine. This episode shows Sportacus being just as active and agile as his adult self and sends the message to kids that its never too early and children no matter how young are capable of amazing things.
- The protagonists of The Legend Of Dick And Dom stumble onto the Fountain of Youth (or fall into the Muddy Puddle Of Youth, anyway) and are regressed to childhood just in time to meet a bunch of witches who... really like children. Naturally, the witches end up falling in themselves by the end.
- In episode 16 of an old Sentai series called Kyodai Ken Byclosser, the villains use a weird gun to revert a couple of children (Yeah, children, strangely enough) to infancy, before turning them into old people with another gun. A young woman is also regressed into a baby. Obviously, all of them are eventually turned back to normal.
- A short-lived late-70s sitcom called Big John, Little John was about this guy who, having unwittingly taken a sip from the Fountain of Youth, was prone to turning into a twelve-year-old at inconvenient times.
- An episode of Sir Arthur Conan Doyles The Lost World had the gang meet a woman with water from the fountain of youth. Unfortunately, her supply runs out and she reverts to her true age and dies. Professor Challenger drinks a little of the water, and while it doesn't make him look younger, it heals his wounds and makes him temporarily strong, agile, and energetic like a teenager.
- On an episode of Smallville, an old man takes a spill into the koi pond at his retirement home, which turns out to be lined with Green Rocks that make him physically 50 years younger. Unfortunately, he turns out to be a sociopath with a long list of scores to settle, one of which is against the Kent family.
- Once Upon a Time: August has turned back into a young Pinocchio, probably permanently.
- In Charmed, one is being guarded by nymphs, but is really more of a Healing Spring. Another one shows up, and this one actually looks like a stone fountain. Irritatingly enough, Piper says "But that's just a myth!" when confronted with the second one, even after having come across the first one, possibly because she and her sisters had promised the nymphs from the first fountain that they would keep its existance a secret.
- In The Outer Limits (1995) episode "The Last Supper", an elderly scientist is tracking an immortal woman in the hopes that her blood will restore his youth. After all, he tried it on his (literal) guinea pig the last time he had her in custody and it's been alive for decades. In his desperation, however, he doesn't think his plan through and just scales up the dosage relative to body mass. He gets his youth, plus interest.
- In The Flying Cestmir, Cestmir gains seeds for six magical flowers. One of them causes people to de-age for a certain period of time until the effects wear off. The old professor uses it, but apparently nobody else does.
- In the Supernatural episode About a Boy, Hansel goes around kidnapping people and rejuvenating them to young teens for Katja the witch to feed on, as actual children are too protected by the law for her to kidnap them without being found. Dean and a woman named Tina end up falling victim to this, but while Dean managed to turn himself back before finishing the witch off, Tina didn't. However, that didn't bother her; Dean offered trying to find another way to return her to normal, but she opted to stay as a kid and get a second, better chance at life.
- The video for Foster The People's "Helena Beat" has the frontman's character get kidnapped by a pack of wild children and strapped to a contraption with an old man at the other end. The machine saps whatever youth the old man had left and transfers it to him, turning him into a child. One wonders if all the other kids in the pack didn't arrive by similar fates.
- In a recent strip for Liō Lio uses a time machine to go to the beginning. As a result he is sent back to the womb.
- One time in Jump Start. Marcy and Joe are buying noth their infant twins a toy. They comment that because they have twins they have to buy two of everything. They then mention they have four kids, the next panel shows them, their two older kids as babies. The same age as the twins. They then comment they are a family of sextuplets.
- One Charles Addams cartoon shows a group of children standing next to a fountain in a jungle, all holding metal cups and dressed as Spanish conquistadors. One of them is saying "So, great. We found the Fountain of Youth. Who's gonna sail the old tub back?"
- Mentioned in the backstory of Heroscape as one of the side effects of drinking from a Wellspring, the other perks being enhanced strength, magic and prophetic visions.
- Civilization V features a Fountain of Youth as a World Wonder. All units that move adjacent to it gain the Double Healing promotion for free.
- Gilgamesh from Fate/hollow ataraxia did this with a youth potion because, apparently, "this whole mess is stupid, screw you all". All the more hilarious, considering that he's been a tyrant (in the past), not to mention a dog-kicking Knight Templar and Big Bad who wanted to unleash a terrible curse on humanity because only those who could survive it were worthy of being ruled over; when he reverts, he turns into a cute little boy that everyone loves.
- A fountain of youth is present on Easter Island in the Sam & Max: Freelance Police game Moai Better Blues, the reason that the island is populated by babies.
- In The Curse of Monkey Island, Guybrush is age-regressed to the form of a young child when he is trapped in the Carnival of the Damned by Lechuck. This also happens to him at the end of Money Island 2: Lechucks Revenge, but is actually an illusion to trick him rather than physical.
- In Brain Lord, in the second magic shop you come across, you find it is run by three old women. If you go in the kitchen and talk to the old women there, she'll offer to let you try a new youth potion. Drink it, and instead of you being youthened, all three of the elderly women change to teenagers.
- The Golden Suit in Henry Hatsworth In The Puzzling Adventure grants youth to whoever wears it. Henry's in his sixties/seventies, so when he dons it, he is restored to young adulthood. Cole, unfortunately, is only ten or so - so when he dons it in The Stinger, he's reduced to infancy.
- The "Babality" finishing moves in the Mortal Kombat games, in which the victor would somehow turn the loser into an infant.
- Seeing as how this is a franchise known for its violence, programmers wisely fixed it so the winning player lost control of their character the instant their opponent became a baby; the victor would immediately go into their win pose. The idea behind the babalities was to provide a more innocent alternative to the infamous fatalities. Unfortunately, a glitch was later discovered that, when exploited, allowed you to viciously attack the baby.
- Despite being unpopular to most fans of the series, the finishing move made a return in the 2011 game "Mortal Kombat". This time instead of the opponent turning into a baby and sitting while crying, the babified opponent would now do a funny animation relating to them. In fact now, even the bosses can have a babality done on them.
- in Drakengard, everyone who make a pact with a creature has to sacrifice something. Seere sacrificed his "time", which meant that he'd never age, and never grow up. This would possibly be considered Cursed with Awesome except Seere is six and will be so for his whole life. The fact that he's travelling with a pedophile and a cannibalistic elf with a specific taste for children does not help in the least.
- At the end of Emerald City Confidential, Petra deliberately does this to William to save him from life imprisonment and his memories of having been a Phanfasm spy.
- Borf's weapon in the full-motion video game Space Ace turns people into infants. He had already used it on the main character, which turned him into a rather weak teenager, but at certain points in the game the player can temporarily restore Space Ace to his proper age. And of course, he ends up being Hoist by His Own Petard.
- In the King's Quest series, there have been 2 cases of this trope.
- In Radical Dreamers, this is an important plot point: Kid is revealed to be Schala from the previous game: After the Ocean Palace incident, she was overcome by grief and guilt over what her actions had caused. The Frozen Flame picked up on those emotions, and responded by transforming her into a baby, erasing her memories, and sending her to the modern era, where Lucca found her and raised her. Granted, this game is not canon anymore, but an easter egg from Chrono Cross implies that the events of Radical Dreamers actually happened in another dimension, and one of the many ending cutscenes in Chrono Trigger DS actually does show Lucca finding baby Schala/Kid and adopting her
- In Mai-HiME Fuuka Taisen, Yukariko's Child turns her opponents into young children.
- The Sims 2 had the Elixir of Life Aspiration reward, and the "milk" produced by the cowplant available in the University expansion after it eats a sim, which is a more potent version (making a sim 5 days younger per dose rather than three). The Generations expansion for the third game added the "Young Again" reward, which is Exactly What It Says on the Tin, and the Age Freeze reward, which is also Exactly What It Says on the Tin. And then there's the Fountain of Youth (literally a fountain) that came with the Hidden Springs neighborhood...
- In the Tekken games starting from Tag 2, Heihachi Mishima has found a way to rejuvenate himself back to his prime thanks to a serum made from Ogre's blood. This change has only shown in non-canon games so far, but given that it was induced by Daisuke Gōri's unfortunate suicide, it's likely to stick to the canon series as well.
- In Magical Drop 3, the Final Boss Wheel of Fortune is sent back to the past and transformed into a baby after she is defeated.
- In Tomodachi Life one of the random rewards you can get from granting Miis their requests is a Kid-O-Matic spray, which turns an adult Mii into a kid. There's also the Age-O-Matic spray, which does the opposite. Though if you use it on a old wrinkly, grey haired Mii. He/she will still be grey and wrinkly, just shorter.
- In Opplopolis during Luke Dugans' interview with Shirley Kidd about a mysterious movie she appeared in called Marvedyne (that word being the series' MacGuffin), the latter suddenly de-ages from 60-ish to 20-ish with thus far no explanation, though there was a conspicuous cup of coffee earlier in the scene.
- When Mingmei in The Wotch discovers that she used to be Dr. Sorgaz, everyone assumes that she would want to be turned back… except the Sorgaz persona himself, who basically takes it as a second chance in life, and instead opts to merge with Mingmei permanently.
- Not to mention 21-year-old Evan's frequent temporary escapes into a 4-year-old (female) body, called "Lily".
- Seriously, what about the entirety of Adventures in Babysitting? Even though Evan turns into an adult female, Anne, Robin (Robyn?), and Jason were turned into children (Okay, they turned into the opposite gender too, but that hardly matters!)
- Emily from Misfile suffers from this, though she was only regressed by two years rather than the usually much larger amount. Since she was just about to turn 18 and had received her acceptance letter from Harvard these were a rather vital couple of years though.
- In one strip of Axis Powers Hetalia, England de-ages Korea to make him less annoying. In a later April Fool's Day event he does it again to France.
- The Dragon Doctors:
- A team of magical robbers are trying to steal a large drum of rejuvenating fluid in the "Thieves of Life" arc. An acid booby trap cracks open the drum, however, exposing one of the thieves to an overdose of the fluid, immediately transforming her into a baby.
- A Backstory chapter features a lake of youth that is responsible for the 'deaths' of several colonists. It's basically a Deconstruction of the Fountain of Youth: the lake is hidden because everyone who goes near it dies. Nothing grows around it because it causes everything to un-grow, so it's a desolate wasteland. Even contact with the vapors from it can erase years or decades of age from someone, so most people who get close wind up vanishing into Empty Piles of Clothing (which, incidentally, is the Trope Namer for that). The discovery of that lake was actually what enabled the development of the previously mentioned rejuvenating fluid, after people figured out how to harness its effects.
- Morgan of Gender Swapped after pestering Sven long enough to bend the rules for the two of them
- In El Goonish Shive, Dr. Germahn invented one.
- Ponce de Leon and his companion look for one in Oglaf, but only come across the fountains of Doubt,
Death Water So Good Even Dead People Want It, and Girl (NSFW).
- In Kevin & Kell, the vulture family have a time machine where they sometimes travel to the past. But in some cases, if used right, it can affect someone's age.
- Dolly who is a clone of Corrie, begins to age faster than usual. A new identity is created for her and she gets a job as a cleaning lady for the vultures. While cleaning she accidentally activates the time machine and is turned into a baby where she remains still.
- In other strips the characters are briefy turned into babies for laughs, but these are probably not canon.
- The Kids arc of Roommates where the resident magical troublemaker Schmuck Baits ("What does this glowing orb do?!") the other main cast members into this and we learn that some people changed a lot... others not so much. Thank god the magic only lasted thirteen hours.
- In Doc Rat, heavy duty anti-ageing cream regresses a bird back to an egg.
- Karin-dou 4koma: Seren and Elza's independent attempts at weight-loss magic actually turn them into children. Seren eventually turns herself back, but Elza prefers her new form.
- In Jix one of Lamerix's inventions instantly changes one's age, she loses it in the couch cushions and Lauren is accidentally turned into a child after sitting on it, though she eventually reverses it. Later on, she uses it to turn Aragara, who had been artificially aged by growth hormones back into a kit.
- In Autumn Bay, Lieutenant Bishop, leader of the team tasked with capturing the mysterious entity known as Nesariel, is transformed into a teenage girl.
- in True Villains, old, wizened sorcerer Bayn Pheonix is transformed into a kid by demon Xaneth Antaris.
- Mini Mari! kicks off when Marisa Kirisame eats a mushroom that reverts her back to the body and mentality of a child.
- Whateley Universe example: retired U.S. Navy officer Sam Everheart was injured trying to save a Hot Scientist from bad guys. The 'hive' of nanites infected him and saved him.. by turning him into someone a lot younger. He now looks like his deceased 17-year-old daughter.
- In the aptly-named "Baby Boom" episode of Gotham Girls, Harley is accidentally regressed into a baby.
- In the Disney Channel cartoon series Jake and the Neverland Pirates episode "Pirate Sitting Pirates", Captain Hook as usual is being chased by Tic Toc Croc. As a result they both take a tumble knocking themselves as well as Jake and his friends into the pirate pool of youth, which can turn pirates into wee pirates. As a result they are all turned into babies. Now Smee and the other pirates must look for a flower that can turn them back.
- Super Sunday: The entire series "Bigfoot and the Muscle Machines" was built around a young journalist, the members of a traveling monster truck show and a ruthless elderly billionaire named Adrian Ravenscroft searching for the Fountain of Youth. When Ravenscroft gets to it first, he turns into a young, 30-something man, vowing to destroy his adversaries. But the good guys destroy the fountain of youth, and it isn't long before Ravenscroft reverts to his elderly self ... fleeing but unknowing running into a swamp infested with hungry alligators.
- The Emperor's New School features the actual Fountain of Youth in one episode. Yzma uses it to become a (surprisingly attractive) teenager in order to trick Kuzco. It also features Pacha and Chica becoming teenagers, and ends with Yzma and Kronk becoming (somewhat freaky looking) babies.
- One episode of Lilo & Stitch: The Series involved an experiment known as the "Babyfier" that turned its victims into infants.
- Spider-Man: The Animated Series: The aged crime lord Silvermane's long-standing goal was to find a way to restore his youth. Unfortunately, the Applied Phlebotinum worked a little too well, and he reverted to infancy. A later attempt to fix it also works too well, restoring him to his original old age instead of to his target age.
- Adrian Toomes, the Vulture, shares the same goal and even uses the same Applied Phlebotinum as Silvermane. It works out considerably better for him, to the point that he is the only villain in the entire series who gets everything he wanted in the end. He's also the reason Silvermane's attempt to undo his infancy works too well.
- In the Woody Woodpecker short Born To Peck, this is added in at the last second by the animator to save the life of an elderly, suicidal Woody.
- One Star Trek: The Animated Series episode had the Enterprise get sucked into a parallel universe where entropy was reversed and things aged backwards; they quickly started getting younger and younger, leading to an adorable 7-year-old Spock trying to hold the mission together.
- Luckily, the (non-canon) first captain of the Enterprise, Captain Robert April, was on-board. He de-aged from an elderly man to roughly Kirk's true age.
- Two episodes of the original Teenage Mutant Ninja Turtles dealt with this; in "Back To The Egg" it happened to Leonardo and Michaelangelo, and in "Adventures In Turtle Sitting" Leonardo, Raphael, and Donatello turned into children and the slacker of the group Michaelangelo had to look after them.
- Another episode "Leatherhead Terror of the Swamp" when the mixture of the leftover mutagen that affected the Punk Frogs and Leatherhead is concentrated creating the Fountain of Youth. Shredder accidentally fell in the fountain turning him into a baby.
- Code Name Kids Next Door had an episode where the Fountain was revealed to be under the school, kept secret by one "girl" who had been using it for years. The Delightful Children from Down the Lane were naturally opposed to its existence and wanted to destroy it.
- Peach got turned into a baby in The Super Mario Bros. Super Show after falling in the Fountain of Youth. To get her back to her real age, the brothers had to make the waterfall in the fountain go up instead of down and put her in the fountain.
- In the DuckTales episode "Sweet Duck of Youth," Scrooge looks for the literal Fountain of Youth so that he can live longer. It turned out that the fountain only made a person look younger when reflected in its waters.
- Donald Duck tries to trick his nephews into believing they've found the fountain in "Don's Fountain of Youth." Hilarity Ensues.
- Quack Pack has the episode "Can't Take a Yolk" where Donald really is regressed to youth— represented here by an Art Shift to his original character design from the 1934 short "The Wise Little Hen".
- In the Justice League Unlimited episode "Kid Stuff", Morgan Le Fay's son Mordred gets his hands on a powerful amulet and, in a fit of pique after his mother insists he's too young to be responsible for it, banishes all the adults in the world to a pocket dimension. Morgan gets around this by turning some of the Justice Leaguers (Batman, Superman, Wonder Woman, and Green Lantern) into 8-year-old children so they can get the amulet back. Eventually, Mordred is tricked into breaking the spell that keeps him a child, and he vanishes into the pocket dimension as per the rules of his earlier spell. In the end, it turns out that breaking the spell meant he still had eternal life but without eternal youth, and was now thousands of years old and effectively immobile, basically a vegetable that his still-young mother will care for — Forever. harsh. Of course, one wonders if Morgan can't just cast it again... or just won't.
- Ben 10 also features the literal Fountain of Youth (though it's more of a natural pool or spring). Max turns into a 10 year old and is revealed to be similar to Ben at that age. Ben and the aliens turn into toddlers. It wears off.
- Ben 10: Omniverse has a de-aging ray used against Ben and Rook. Tara Strong returns to voice young Ben, and li'l Rook is ridiculously adorable... with a tail, which his species is born with but sheds at puberty.
- In Spongebob Squarepants, Plankton develops both a super-aging ray and a de-aging ray. The latter ends up working a bit too well, turning him into an even smaller protozoa.
- Futurama did this in "Teenage Mutant Leela's Hurdles", where overexposure to rejuvenating tar resulted in Professor Farnsworth going back to late middle age, and the rest of the Planet Express crew (including the robot Bender) becoming teenagers. An attempt to reverse the process made things worse, which instead just sped up the regressing, and everyone but Leela (who opted out of the cure, in order to relive the childhood she never had) started regressing into early childhood, most of the characters went so far back that they turned into fetuses (blueprints in Bender's case).
- And then the trope is parodied when they seek to be cured at the Fountain Of Aging.
- Happens a few times in The Superhero Squad Show all due to messing around with time manipulation;
- The first time Thanos uses the Time Stone to de-age all of the occupants of a Skrull Ship and captain Marvel into babies, for his own amusement.
- Happens again when Iron Man's time machine backfires and turns Iron Man, Scarlet Witch and Falcon into toddlers, where Wolverine (to his dismay) has to babysit them, while the childish Hulk enjoys it. The opposite happens to Ms. Marvel and Thor when Dr. Doom gets control over time, but Herbie then reverses all of the inappropriately aged squaddies back and in the process turns Dr. Doom into a toddler as well.
- An episode of Care Bears (1980s) features it, with the heroes going on a quest to find it and the villains not far behind. Shreeky eventually does drink from the fountain, but because she's a little girl to begin with, she turns into a baby.
- In an episode of Hercules: The Animated Series, Pain and Panic try to kill Hercules (again), this time by using water from a spring that reverses aging. They accidentally get water on not only Hercules, but on Icarus, Adonis, Pegasus, and Pain himself. Panic and Cassandra have to watch them since they're all infants until they can find a cure.
- In the Bump in the Night episode "Baby Jail," Bumpy accidentally swallows some baby formula while trying to feed a baby and becomes one of them.
- Occurs in a great many cartoons in general. Often, with the humorous side-effect of the subjects eventually reverting to their true age while wearing a diaper.
- The Karate Kid The Animated Series: In "Over the Rainbow" Miyagi, Daniel, and Taki stumble on a hidden community with one fueled by the shrine.
- Two instances happened in Kim Possible. The first was when in the Made-for-TV Movie "A Sitch In Time" where the teamed up bad guys, having possession of time traveling idol, used a device to make themselves toddlers so they could infiltrate the titular hero's youth.
- The second was in an episode where Ron was continuously sent through a machine that turned adults into babies. He went through so many times that when he finally got back to his own age, he was wearing a diaper.
- There have been a few episodes in Darkwing Duck that feature this.
- An elderly villain attempted to actually make one of these so as to regain his youth and become immortal. His plan worked and he was restored to his prime. Unfortunately, in a fight with Darkwing Duck and Herb, they all became babies. In the end the fountain was destroyed and his henchmen were turned into babies as well while Darkwing and Herb turned back.
- In "Disguised the Limit", Darkwing is framed for a crime he did not commit. So a scientist blasts him with a ray gun that will turn him into anything he sees. At one point he turns into his daughter and a baby.
- In one episode, Darkwing becomes super fast but the more he does it, the older he becomes (see overnight age up). In the end he fixes it by running backwards to become younger...at one point a little too much and becomes a kid.
- In Teen Titans Warp is reduced to infancy after his time suit malfunctions.
- In one Betty Boop cartoon, the patent medicine she and her pals are peddling turns an old bearded man into a large baby - and the baby accompanying him into a tiny old bearded man.
- In one episode of the third season of Winx Club, the Winx had to retrieve water from a magical stream that was capable of turning back time so they could save Faragonda who had been transformed into a tree by Valtor. However, they had to be careful not to touch the water, realizing that doing so could cause them to turn back into children. Near the end of the episode, after Flora earns her Enchantix after saving her younger sister from the Trix, she then throws the Trix into the water, turning them into preteens. Of course, the Trix are back to normal in later episodes, so Valtor must've been able to restore their true ages.
- The "Little Muriel" episode of Courage the Cowardly Dog has Muriel being turned into a mischievous little girl by a freak tornado. It then turns out the only way to undo the effect is to throw her into a tornado spinning in the opposite direction of the original one - which entails flying to the southern hemisphere.
- Leave it to Superjail to come up with a twisted, disturbing take on this one. When the Warden is feeling old and decrepit on his birthday, Jared buys him some "ancient Chinese mystery butter" that's supposed to restore someone's youth. It ends up getting put on the birthday cake, though, leading to a bunch of inmates regressing to toddlers. Toddlers who then proceed to violently kill each other.
- Happens to Batman note in Batman: The Brave and the Bold after he was zapped by Dr. Sivana starting as a teenager, then a toddler, and then a baby.
- The Problem Solverz episode "Time Twister" features a roller coaster capable of traveling through time, which Alfe takes advantage of by going back in time to eat pizza over and over again, and he becomes younger as a result.
- In The Mask episode "Little Big Mask" Stanley Ipkiss creates a cream that causes him to get younger by the hour and he as The Mask must find a way to fix it while Peggy tries to keep him focused.
- In the cartoon version of Space Ace, the Infanto Ray made some appearnces; one of them was episode 3, in which the victim was Borf. Another example is episode 6, where the Infanto Ray was just a round circle. However, it made its return in episode 11, in which Borf uses it on the vicims, and one of them was Kimberly, but after Dexter was brainwashed with the brainwashing device, Kimberly turned back into her adult form right after Dexter grabbed Kimberly while in the prison.
- Another ray, the Age Ray appeared in another episode before episode 11. The Age Ray was meant to be used on Dexter so that Dexter can remain as Ace, but when Borf gets hit by the Age Ray, he does not turn into a baby, but rather into a teenager, and Borf energizes at random times throughout the entire episode like Dexter.
- In an episode of Adventures of Sonic the Hedgehog, Dr. Robotnik plans on defeating Sonic by making him so old, he won't be as fast. As usual Scratch and Grounder mess things up by putting the device into reverse, turning Sonic into a toddler and Tails into a baby. Later Robotnik is too turned into a toddler. At the end Robotnik is turned into an old man.
- Rocko's Modern Life: Rocko, Heifer, and Heifer's Grandfather are on a cruise filled with senior citizens when they cross The Bermuda Triangle, which alters their ages. Giving us a mix of overnight age up and Fountain of Youth, all the elderly revert back to young(er) adulthood, the ship's crew become babies, and Rocko and Heifer become elderly.
- A while ago, McDonald's released cartoons on VHS featuring Ronald McDonald and his friends having adventures. One such cartoon saw them go to an amusement park called Birthday world where him and his friends are turned into toddlers and babies.
- In an episode of the cartoon Yogi's Treasure Hunt called "Secret Agent Bear", Yogi and his pals spoof James Bond movies. In it they accidently fall into the fountain of youth and the adults become little kids and the kids become babies. Later the villian uses the water to turn world leaders into kids and then is turned one himself at the end.
- The final The Fox And The Crow cartoon, "Punchy De Leon" has Fox and Crow as con men who claim to have found the Fountain, hoping to get rewarded by the King of Spain. When the King wants them to bring it for real, they set off to Florida to find it.
- In the Tiny Toon Adventures episode "Love Disconnection" (and within that, the segment called "The Amazing Three"), Shirley the Loon tries to make the moves on an older male duck at a senior dance by asking him what his astrological sign is. Out of his beak comes Antiquated Linguistics as he belittles her, telling her how childish and unfounded astrology is. However, she has such a hard time understanding him that she reverts into a baby! Prior to that, Shirley said that she would impress the duck with her "keen wit and intellect".
Shirley: Like, umm, what's your sign?
Duck: Ah! A devotee of the unseen world. The universe fantastique. Almost amusing in an infantile sort of way, though terribly childish and laughably unfounded. (Shirley reverts into a baby)
I believe Voltaire
put it best when he likened astrology to astronomy as the mad daughter of a wise mother. Don't you agree?
- The episode "Fields of Honey" reveal that laughter keeps toons young. This is shown where upon having people laugh at her cartoons after so many years, an elderly Honey is restored to her prime.
- My Little Pony: Friendship Is Magic: Age spells can only be performed by the highest-level unicorns. Trixie is able to turn Snips into a baby and Snails into an old stallion with her magic boosted by an Alicorn Amulet; Twilight Sparkle, on the other hand, is unable to reverse it. In order to rid Trixie of the corrupting amulet, Twilight fakes it by claiming to have an equally powerful artifact while having Apple Bloom and Sweetie Belle impersonate Applejack and Rarity respectively. Twilight pulled it off for real in "The Cutie Mark Chronicles", though, though not intentionally; during her entrance exam to magic school, she was startled and lost control of her magic, turning the not-yet-hatched Spike into an adult dragon.
- The second to last episode of Rugrats (AKA Fountain of Youth) has Tommy, Chuckie, & Kimi think that the fountain of youth exists. They are happy until Angelica tells them that she will be in charge when its powers take effect on the adults & tricks them into thinking that the fountain in the lake has said powers. After several unsuccesful attempts at preventing the adults from going into the lake, they decide to drain the lake... by pulling on a chain which might actually be attached to a boat which is far too heavy for them to move by even an inch.
- In a cutaway gag on Family Guy, Ponce de Leon Griffin finds the Fountain of Youth and takes a dip, keeping his head above water. When he emerges, his body is the size of an infant, but his head is still adult-sized; he promptly topples over.
- Jackie Chan Adventures:
- The Dog Talisman gives its holder immortality. While it doesn't make the holder look younger, it makes him feel younger. Thus Uncle becomes incredibly strong and agile like he used to be.
- Characters sometimes get turned into children by spells.
- An episode of The Jetsons "Boy George" has George turn into a kid, though his voice is exactly the same. Another episode averts it by having Elroy turn into an old man.
- Transformers Rescue Bots: Dr. Morocco stole a mechanical Fountain of Youth that he uses to stay young but he must use it very often due to the effects of the machine which make him age much faster than usual.
- Johnny Bravo: In one episode, Johnny drinks a potion that reverts him to infancy- physically, at least- to the delight of his mother... until she gets busy and sends him off to day care with an attractive caretaker, to his delight. In the end, he's restored to his adult body.
- In Adventure Time, the (apparently) 18-year-old Princess Bubblegum suffers an accident in which she loses some of her body mass. Being a sentient wad of bubblegum in a generally princess-like shape, she is saved by being reconstructed in the shape of an apparently 13-year-old princess. Since The Mind Is The Plaything Of The Body, this also causes her personality to take on the traits of a 13-year-old. The situation is, of course, temporary. note
- The Oggy and the Cockroaches episode "Back to the Past" features Oggy, Jack, and Bob accidentally facing the wrath of a witch and turned into elementary school-aged kids, with Olivia and Joey forced to track the witch down to reverse the spell, while Dee Dee and Marky watch over the three. In the end, the same ends up happening to Joey, Dee Dee, and Marky.
- In a relatively rare example of kids getting younger, the Phineas and Ferb episode Agent Doof has the titular characters being turned into babies. Needless to say, Candace ended up a Badly Battered Babysitter in record time. And at the end of the episode, even their mother and the Fireside Girls are turned into babies. Candace is obviously exasperated, and openly hopes it wears off by the next episode (which it also obviously does).
- Happens in The Legend of Korra episode "A New Spiritual Age", when Korra's emotions cause her to age down into a child while in the Spirit World.
- In the Donkey Kong Country episode, "Ape Foo Young", Cranky makes a potion that will make him 40 years younger, with the help of the vision of his past self. However, the effects of the potion are only temporary. Donkey Kong drinks the potion and de-ages into a baby. Diddy gets Candy to look after him until the effects wear off by telling her he's DK's nephew. At the end of the episode, King K. Rool drinks the potion and de-ages into a baby as well.