%% Image moved to MumLooksLikeASister per Image Pickin' thread: http://tvtropes.org/pmwiki/posts.php?discussion=1442604678026885400
%% Please start a new thread if you'd like to suggest an image.
->''"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}}''

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 father ''was''. The ''Literature/GuinnessWorldRecords'' dropped the "Youngest Ever Mother" category held by Medina out of exactly these ethical considerations; there was also the fear that somebody somewhere was going to try to '''beat''' this record. ''Wiki/{{Wikipedia}}'' has a lengthy list of [[https://en.wikipedia.org/wiki/List_of_youngest_birth_mothers young mothers]], nearly all of which have very heart-breaking backstories.[[/note]]

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.
* NotAllowedToGrowOld: After a TimeSkip, the children grow up but the parents still appear the same.
* 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.

Subtrope of HollywoodOld. Compare and contrast PlayingGertrude, where the ''actor'' playing the parent is absurdly youthful although the character may not be.



[[AC:Faked parentage]]

[[folder:Live Action TV]]
* In the ''Series/OurMissBrooks'' episode "The Wrong Mrs. Boynton", Miss Brooks unwittingly offers to masquerade as Mr. Boynton's mother. This is in spite of the fact she is actually a couple of years younger than her LoveInterest. ItMakesSenseInContext.
* 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).
* {{Discussed}} in the ''Series/AgentsOfSHIELD'' episode "T.R.A.C.K.S", when Agents Coulson and Simmons are posing as father/daughter family. Simmons comments that Coulson is "far too young to have a daughter my age." (Though it would seem she's just being polite: [[AllThereInTheManual the official website]] states that Coulson was 49 and Simmons 26 at the time the mission took place, meaning that they could easily be father and daughter at their respective ages.)

[[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.



[[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.

* ''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... Or maybe that was the point.[[note]]While children giving birth around the age of 14 can be TruthInTelevision, it is fortunately exceptional.[[/note]]

%% [[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 principal photography took place.
%% commented out because this seems like a straight example of PlayingGertrude, but I lack the confidence to straight up delete it. It has been copied over there though.
%% [[/folder]]

* 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 [[WritersCannotDoMath 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....
** A more subtle but still prominent example would be with Harry's parents. Going by the birth and the death dates, Lily Potter gave birth to Harry when she and James were 20, and both of them died when only 21. While not completely out there (they were crazy for each other by the end of school, and James had both a good job out of school ''and'' a good bit of old family money that Harry himself later inherits, so providing for Harry wasn't a challenge), it does still feel jarring, especially given how old they're portrayed as in the movies. Rowling does acknowledge this later on.
* In W.E.B. Griffin's OSS series, one of the major characters is the son of a Hollywood star, who, if one believes her official studio biography, gave birth to him at thirteen. However, this is entirely due to the studio claiming that she's younger than she actually is due to the fact that she always plays TheIngenue, and they need to make her look as if she's young enough to plausibly play that role (They try not to draw attention to the fact that she has an adult son - who is only legitimate because she married the father for one year to avoid any possible scandal connected to the pregnancy - whenever possible).

[[folder:Live Action TV]]
* In ''Series/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.
* In the third episode of Series/GirlMeetsWorld, Topanga tells a small child that she's 30. Topanga and Cory have a daughter, Riley, in 7th grade. If Riley is normal age for her grade (12-13), Topanga had her when she was 17-18. Given that Series/BoyMeetsWorld goes through Topanga's second year of college and she had no children up until that time, clearly someone didn't do the math.
** That or she was simply lying about her age.

[[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.
* In ''VideoGame/TheSims 3'', Boyd and Susan Wainwright are 11 days until Elder while playing in normal lifespan (AKA they're 62 SimDays old), while their daughter, Blair, is in her very first day of Young Adult (31 SimDays old), meaning that Blair was born while both her parents were in their very first day of Young Adult, and thus she would have been conceived when her parents were teens in "normal gameplay". In the meanwhile (a completely different family/household but still in Sunset Valley) Leighton Sekemoto is 19 days until Adult (basically middle-aged) while his son, Sam, is on his first day of toddler. This is because, while 1 SimDay = 1 Year in the Child, Young Adult, Adult, and Elder Stage, it equals 6 months in the Baby, Toddler, and Teen lifestage.
* ''SuperMarioBros'': Not the case anymore; but the Koopalings were once considered to be Bowser's children along with Junior. Bowser himself is only a few years older than Mario (who is 26); and the Koopalings are all teenagers or young adults. If they're considered Bowser's children; Bowser would only be about ten years older than Ludwig (the eldest).
* Due to poor translation rather than poor math, an NPC in the first ''VideoGame/MegaManBattleNetwork'' says that ten-year-old Lan's grandfather, the famous Dr. Tadashi Hikari, is forty-five years old. Yikes. Later games in the series clarify that Tadashi ''died'' at forty-five (of a genetic heart problem), before Lan was born.

* ''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.



[[folder:Anime and Manga]]
* [[spoiler: Diva]] from ''Anime/BloodPlus'' looks, sounds and even acts very youthful, if not childish and immature. She becomes this after [[spoiler: she [[KillTheCutie rapes and kills Riku.]]]], who happens to be 13 years old. She does mature slightly a year after the [[spoiler: TimeSkip.]]
* 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.
* Konata's mother Kanata from ''Manga/LuckyStar'' looked incredibly young throughout her life and (sometimes) acted accordingly. This fact gave fuel for some interesting speculation about the preferences of Konata's father Soujirou.

* ''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.
* ''Webcomic/AkiChansLife'' is a particularly extreme example, with fourteen or fifteen year-old Asuka and Shinji being parents of a four year-old girl. [[KidFromTheFuture Time travel was involved.]]
** Of course, even in the ''[[FanFic/TheSecondTry previous story]]'', Asuka was probably only about fifteen or sixteen when she gave birth to Aki. Even that's just a guess on her and Shinji's part as they weren't bothering to keep track of time after the apocalypse.
* ''Fanfic/TheChildOfLove'': Asuka gave birth Teri when she and Shinji were fifteen. During her birthday she admits she is too young to be a mother.
* In Fanfic/RainbowDoubleDashsLunaverse, Ditzy Doo was just ''barely'' legal when she got pregnant with Dinky.

* ''Literature/ABrothersPrice'' justifies this trope by changing the definition of "mother". All sisters of a child's birth mother who are still part of the same family group[[note]]Aunts are possible, in cases where there were so many sisters the family split into two groups. This has happened at least once with the Whistlers, with another split likely in the current generation[[/note]] are her mothers. This makes possible a situation in which someone's mother is the same age as her, or possibly even younger.
* Seems to be pretty heavily implied as the norm in ''Literature/{{Allegiant}}'', given that Natalie and Andrew [[spoiler:were together before they entered Abnegation together]], and that [[spoiler:the Bureau requires that all persons entering the experiment promise to have a minimum number of children to ensure the survival of their "corrected genes"]].