History Main / EmotionalMaturityIsPhysicalMaturity

* The original ''WesternAnimation/{{Thundercats}}'' series played this mostly straight: Lion-O was, chronologically, about the same age as Wilykit and Wilykat, but matured to adult size (while in cold sleep) during the trip to Third Earth. He generally acted like a grown-up, but on the occasions he acted his true age (like a kid), he'd generally get scolded for his "immaturity". Justified in that, as "Lord of the Thundercats," Lion-O had a standard of behavior to uphold.

* In ''Anime/HowlsMovingCastle'' Sophie starts as an old soul in a young girl's body, but after she gets cursed her age starts to fluctuate based on her mood and enthusiasm for a developing relationship with a young man.

* In ''Anime/HowlsMovingCastle'' Sophie starts as an old soul in a young girls body, but after she gets cursed her age starts to fluctuate based on her mood and enthusiasm for a developing relationship with a young man.

* Happened with [[AudienceAlienatingEra Gwen Stacy's children]] in the ''Franchise/SpiderMan'' story Sins Past, who grew up fast by AppliedPhlebotinum because ComicBookTime means they would only have been 9 years or so old. Imagine [[http://www.comics.org/issue/224417/cover/4/?style=default this cover]] with a 9 year old.
* There was a clumsy attempt to invoke this trope when [[Franchise/GreenLantern Hal Jordan]] hooked up with the teenage Arisia; Arisia unconsciously used her ring to make her body become mature, and claimed that her race matured fast emotionally, which would make the relationship okay by this trope. Readers who still remembered that Arisia recently looked and acted teenage couldn't accept this, which led to Arisia's actual age being {{retcon}}ned an number of times. It ended with her age being 240 in Earth years, so it is now her teenage form and not her adult form that fits the trope. The current status of Arisia's age in the New 52 is unknown.

* Basically, ''Film/TheIsland'' significantly justifies and mitigates the FridgeHorror {{Squick}} of a boy and girl who are chronologically only three and four years old, respectively, having sex by applying this trope. Technically, though their memories of childhood and adolescence are all fake, and the ones who cloned them deliberately kept them in the dark about sex and sexuality, those fake memories do provide them with enough simulated years of experience that they can plausibly be as emotionally mature as they should be at the age they appear to be (i.e. twenty-somethings).

* {{Justified}} with Pandora from ''Webcomic/ElGoonishShive'', who is capable of shapeshifting and automatically adjusts her apparent age to match how mature she is currently acting (becoming a young girl to throw temper tantrums or interact with Sarah as a near-equal, assuming more adult forms when she wishes to interact with Adrien as his mother or Tedd as his [[FairyGodmother Fairy Grand-Godmother]]).

* In ''[[https://www.fanfiction.net/s/4403803/6/Baby-Gazzee Baby Gazzee]]'', Dib finds a spell in his spellbook with the description "Act the emotional age you really are, and have people treat you accordingly." When he accidentally uses it on Gaz (who resorts to violence and tantrums to get her way when displeased), it turns her into a baby and makes everyone else think she's always been one.

* ''Literature/{{Twilight}}'' is a painful case. Ignoring Edward and Bella (which if you accept the idea that physical and mental age staying the same can make a lick of sense, they mention that two year old vampires are forever two, is still mildly cringe worthy), you also have the last book couple. A 22 year old man and a 7 year old girl, and it's okay with her parents.