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->''I wouldn't say a word that could be reckoned as injurious,''
->''But to find a mother younger than her son is very curious.''
-->-- ''Theatre/{{Iolanthe}}'', '''Creator/GilbertAndSullivan'''

When you subtract the age (or apparent age) of a child from that of their parent, this results.

Typically done to justify a hot mom, but sometimes, she ''really was that young'' when she gave birth (or the other gender around). Sometimes she only [[ArtisticAge appears this way]] because of the [[GenericCuteness art style]].

In RealLife, a girl can conceive as soon as she has her first menstrual cycle, generally around 11 or 12 years old... although in rare cases this can occur at an even younger age, such as ''five years old''.[[note]]Lina Medina, the girl in question is an example of a case of extreme precocious puberty i.e. puberty at an absurdly young age, and reportedly had started getting her period while she was still an infant. She is the youngest mother ever in recorded history, though she was too young to fully remember the pregnancy and her parents raised the baby as her brother. While the girl's father was eventually cleared of rape charges, there's still the FridgeHorror question of who the parents allowed around their daughter.[[/note]] Compare PlayingGertrude if the actress playing the mother is absurdly youthful.

See also:
* AdoptivePeerParent: Parents remarried, adoption, or gained custody through other means.
* MumLooksLikeASister: The parent ''looks'' younger, or the child looks older. Closely related to OlderThanTheyLook and YoungerThanTheyLook.
* SoapOperaRapidAgingSyndrome: Children are born, then their age is retconned.
* SupernaturallyYoungParent: TimeTravel, Magic, BizarreAlienBiology or Immortality are involved.
* TeenPregnancy: Pregnancy at a young age is clearly implied or stated.

[[noreallife]]
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!!Examples:

[[foldercontrol]]

[[foldercontrol]]

[[folder: Faked parentage ]]


[[folder:Live Action TV]]
* In ''Series/OnlyFoolsAndHorses'', Del wins a family holiday for the Trotters by entering a children's art contest with a picture painted by Rodney when he was 14. In order for them to be eligible to claim the prize, Rodney (who's in his early 20s) has to pose as a 14-year-old boy, with Del (who was 16-17 when Rodney was born) pretending to be his father. Del at least has the sense to claim Cassandra, about the same age as Rodney, as a stepmother.
* Tracy Jordan's adult son on ''Series/ThirtyRock'' is far too old. In an [[AvertedTrope aversion]], Tracy sees through the deception immediately (while his friends assume the {{Cloudcuckoolander}} was actually taken in).
* The ''Series/AgentsOfSHIELD'' episode "T.R.A.C.K.S" had Agents Coulson and Simmons posing as father/daughter family. Simmons even comments the Coulson is "far too young to have a daughter my age."
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[[folder:Western Animation]]
* In ''WesternAnimation/AvatarTheLastAirbender'' season 3, Sokka and Katara fake being Aang's parents at a Fire Nation school. The two of them are barely older than he is and wear [[PaperThinDisguise unconvincing disguises]] (Sokka wore a fake beard, Katara wore a pillow stuffed under her shirt to make her look pregnant.) to pass themselves off. To really blow some heads, just remember that in terms of pure chronological age, he could be their great-great grandfather.
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[[folder: Writers Cannot Do Math ]]


[[folder:Anime and Manga]]
* ''Manga/CardcaptorSakura'': It is never stated how old Syaoran's mother Yelan is, only that she looks very young and beautiful enough to stand out [[Creator/{{CLAMP}} in a universe]] ''populated'' by TheBeautifulElite. She is, however, ''thought'' to be somewhere in her mid-to-late 30's, and possibly married as a teenager. This is never confirmed, because she is only seen in the first OVA.
* As mentioned above, in the dub of ''Anime/DigimonTamers'', Ruki/Rika's age was altered, but the age of her mother was left alone. Ruki is implied to have been the result of a teen pregnancy in the original. The dub's numbers indicate that Rumiko gave birth at ''thirteen''. Oops.
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[[folder:Comics]]

* ''ComicBook/KillKiller'' features a story with a "Dirty Callahan"-like killer of pedophiles who, after a lengthy period in prison for beating the supposed killer of his five year old child, reunites with his partner, the mother of the child... a 19 year old teenager. Someone obviously couldn't make a subtraction...[[note]]While children giving birth around the age of 14 can be TruthInTelevision, it is fortunately exceptional.[[/note]]

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[[folder: Films - Live Action]]
* In ''Film/TheHauntedMansion'', Marsha Thomason plays Sara, a mother whose daughter and son are aged 13 and 10, and who is implied to be around the same age as her husband, who is played by EddieMurphy and obviously meant to be in his late thirties/early forties. In reality, she is less than fourteen years older than the actors who portrayed her children, and was clearly only in her mid-twenties when principle photography took place.
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[[folder:Literature]]
* In ''Literature/HarryPotter,'' the [[AllThereInTheManual official Black family tree]] includes birth and death dates; if followed exactly, Sirius' grandfather had his mother when he was only 13. Creator/JKRowling is on record that math isn't her strong suit, so many fans assume she just misplaced a decade. Then again, given the Blacks' status as a BigScrewedUpFamily, it could conceivably be accurate....
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[[folder:Live Action TV]]
* In ''OneLifeToLive'', Greg is explicitly stated (in courtroom testimony, no less) to have ten years' experience as a fully licensed practicing neurosurgeon, putting him in his early 40s at the youngest. His mother is played by an actress in her late 40s, and to make things interesting he has a 15-year-old sister. All the characters were introduced during 2009 so SORAS isn't involved.
* ''Series/{{Supernatural}}''. John Winchester may be ruggedly handsome with a beard, but this hardly hides the fact that he looks MAYBE ten years Dean's senior. The same is true of his wife Mary when she appears in an alternate reality where she is still alive in the present day, played by the same actress who plays her in flashbacks to the brothers' childhood.
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[[folder:Video Games]]
* ''Franchise/DeadOrAlive'': Ayame, the mother of Hayate, Kasumi, and Ayane. She's had three kids, Hayate being in his early twenties and Kasumi and Ayane being in their late teens, and in her every appearance so far, she doesn't appear to be much older than Kasumi.
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[[folder:Webcomics]]
* ''Webcomic/{{Homestuck}}''. Bro Strider. Most fans think of Bro as being in his early/middle 20s, until you sit down and do the math. He was at least an adult - 18 - when he adopted baby!Dave. Dave is thirteen now, making bro at least 31. The same might apply to Mama Lalonde and Dad Egbert, but Mom and Dad seem to be thought of as "older" than Bro, so I don't know. The whole lot of them don't seem to change in appearance between adopting their children and thirteen years later.
** The Egbert Family. Nana was born in 1910. John was "born" in 1996. Dad appears to be a regular middle aged man, but if Nana had Dad around age 20 (as was normal for a woman of her time period) Dad would have to be in his sixties when John is "born." If Dad is about, say, 40 when John is 13, Nana would have had to have given birth to him in HER fifties-sixties. It's unclear how old Dad is SUPPOSED to be, but so far it doesn't seem to add up when considering Nana's and John's ages.
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[[folder: Combination ]]


[[folder:Anime and Manga]]
* In ''LightNovel/SwordArtOnline'', Kirito and Asuna adopt the AI Yui as their daughter. At the time, Kirito and Asuna are 16 and 17, respectively. Yui, by virtue of being an AI appears to be 8 despite in fact being 2.

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[[folder:Fanfic]]
* ''Fanfic/PastSins''
** [[WesternAnimation/MyLittlePonyFriendshipIsMagic Twilight]] adopts the magically generated Nyx. Biologically, they're a late teen[[note]]specifically, the pony equivalent of a college student[[/note]] and child respectively, and that's not even going into the newly-made or millennium-old question with Nyx. [[spoiler:And things get even ''weirder'' when Nyx is artificially aged up to an adult ''horse''...]]
** There's also the fact that some of Twilight's blood was used in the ritual to resurrect Nightmare Moon (due to her status as the Element of Magic), [[EpilepticTrees possibly making her]] a TrulySingleParent or some weird case of HasTwoMommies with Princess Luna.
** Fan works disagree on whether Twilight is Spike's mother figure or big sister figure. ''Today'' she's old enough to be considered a mother figure, indeed the equivalent of a woman in her late teens or early twenties, but many forget that Twilight hatched Spike when she was the equivalent of a third grader. If she is a mother to him, that makes her, well, an [[ExactlyWhatItSaysOnTheTin absurdly youthful]] one.
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