* ''Webcomic/{{Sidekicks}}'': As a result of his [[PowerUpgradingDeformation superpower manifesting]], [[MeaningfulName Hacky]] looks like a young child despite being well over 20 years old.
* ''Webcomic/TowerOfGod'' is an undisputed king of this Trope. Manipulating the FunctionalMagic of their world known as Shinsoo, allows for a person who becomes skilled enough with it to become [[TheAgeless immortal]]. Since the entire cast and ''everyone'' in the the story setting can use Shinsoo, almost all of them are already much older than they look. A prime example is Anak [[spoiler:Zahard]] who has a body of what seems like a child yet is over ''[[Really700YearsOld 300]]'' years old. They ''need'' to be [[TheAgeless immortal]] as well, since their ultimate goal is to reach the top of the Tower that makes up their world and just reaching the 134th Floor[[note]] The highest anyone has ever gotten[[/note]] takes the average person ''500 years''.
* Parodied in ''Webcomic/GhastlysGhastlyComic'' with the character Chibi Sue, a 36-year old woman who appears to be under twelve due to being from a race of SuperDeformed.
* In ''Webcomic/QuestionableContent'', [[spoiler:Amir]] turns out to be about ten years older than he looks.
* in ''ErrantStory'': Meji, age seventeen, looks twelve (she's a half-elf). All kinds of angsting and insecurities ensue. Fellow half-elf, Ian, is 45 and looks like he hasn't hit 20 yet.
** Also, to some extent, [[http://www.errantstory.com/2007-11-23/735 Anita]].
* In ''Webcomic/{{Frivolesque}}'', the reveal that the small, child-like Flore is slightly older than her much more mature looking sister comes off as a surprise. This seem to apply to their father as well.
* In ''Webcomic/TheOrderOfTheStick'':
** Pompey the half-elf is approximately sixteen both mentally and physically; chronologically, he's forty-three, and [[http://www.giantitp.com/comics/oots0258.html complains about being called "kid"]] when it's revealed that he's taking orders from a (human) 21-year old.
** Vaarsuvius has two elf children, aged twenty-six, who look and act like small kids and are currently in kindergarten. Both of these are the result of [[OurElvesAreBetter long elf]] [[WeAreAsMayflies lifespans]].
** Redcloak still looks like a goblin teenager thanks to the Crimson Mantle despite being over fifty (which, for a goblin, is beyond venerable age).
* Also a RealLife one, since it's from a JournalComic, but Shazzbaa from ''TodayNothingHappened'' looks a lot younger than her current age at least since she was eighteen.
** It's not just ArtisticAge -- WordOfGod has insisted that she really does look abnormally young, and she's addressed it in the comic [[http://www.shazzbaa.com/index.php?c=217 more]] than [[http://www.shazzbaa.com/index.php?c=333 once]].
* Nearly everyone in ''{{Earthsong}}''.
* Made fun of in ''[[http://www.shapequest.net Shape Quest]]'', when it is [[http://www.shapequest.net/?id=114 revealed how old Clark is.]]
* Hanna (of ''Webcomic/HannaIsNotABoysName'') is [[http://hanna.aftertorque.com/wp-content/gallery/hannarts/hanna_ref.jpg twenty-four.]] [[http://hanna.aftertorque.com/?p=151 Believe it or not.]] [[MaybeMagicMaybeMundane Whether or not this is natural]] or the result of [[AmbiguouslyHuman something magic]] has not been explained.
* Greg, boyfriend of Kili in ''Webcomic/TheDragonDoctors'', is really 60 but looks about 20-something. However, he's not alone, as apparently quite a lot of people are able to purchase rejuvenation in the setting.
* ''Webcomic/OzyAndMillie'': [[spoiler:Locke is actually Millie's father and in his world, everyone ages backwards. He's actually just a few years away from death.]]
* Weijuaru of ''Webcomic/{{Juathuur}}''. The thing is... he's a shift user.
* The heroines of ''Webcomic/JetDreamAndHerTGirlCounterspies'' are chronologically in their 30s or 40s, but appear to be young women in their early 20s. When the former men of the Thunderbird Squadron were [[GenderBender turned into girls]] by [[AppliedPhlebotinum Virus-X]], the effect also rejuvenated them.
* Vinci, of ''Webcomic/VinciAndArty'', is often mistaken for a child, in spite of being well into adulthood.
* Miho of ''Webcomic/{{Megatokyo}}'' has stated outright that she's older than she looks (about seventeen), though Largo thinks she's [[Really700YearsOld ancient]]. She also refers to a twenty-three year old as "young man" and used to run around with [[spoiler:Yuki's mother, Meimi]], which pushes her estimated age closer to ''forty''.
* [[BadassTeacher Mr. Raven]] of ''Webcomic/ElGoonishShive'' looks fifty-ish, but he's old enough to have taught a current student's mother (herself about forty). At one point, we see him unconscious, and he actually looks ''[[YoungerThanTheyLook younger]]'', implying he has some sort of illusion spell going to make himself look older. Oh, and [[OurElvesAreBetter he's an elf]].
** Grace is 18. Not all that implausible, but this has caused some in-story surprise when people found out that she's the oldest person among the main cast.
* Nina Delacroix of ''Webcomic/EerieCuties'' looks and acts like the comic's TokenMiniMoe, but she's the same age (14) as her friends and in high school.
* Angela from ''Webcomic/QueenOfWands'' and ''Webcomic/PunchAnPie''. She doesn't seem to mind it much, because hey, ordering off the kid's menu is cheaper and you get to color on the placemats.
* Torg and Riff of ''Webcomic/SluggyFreelance'' had been old enough to drink for multiple years (They had been giving each other beers for Christmas) at the start of the comic in 1997. Their comic makes note of major holidays, making ComicBookTime and real time correspond to a rough degree. But despite the fact that those two should be close to 40 years old now, neither they (nor anyone else in the strip) has noticeably aged.
* In ''Webcomic/{{Housepets}}'', it's been hinted at that Sabrina is a lot older than the other pets usually seen in the strip. [[http://www.housepetscomic.com/2013/10/23/ages-ago/ Old enough to remember when not everyone had cell phones.]] This adds a potentially different implication to her relationship with Fido.
* Sera from ''SerenityRose'' is extremely short, and the art for the comic is fairly age-ambiguous, to the point that the artist has on at least one occasion included a disclaimer stating she's in College.
* Jones of ''Webcomic/GunnerkriggCourt'' looks like she is around thirty. She has always looked like that. Always. [[spoiler:She is actually billions of years old and no more human than a rock is.]]
* ''{{Webcomic/Homestuck}}'': Dave's Bro looks to be in his early to mid twenties, and the age gap isn't too wide between him and Dave, in reality he's as old as Rose's Mom [[spoiler: as a Paradox clone sent to earth on a meteor, he arrived at the same time she did]] making him in his thirties-forties.
* If ''Webcomic/AllenTheAlien'''s [[AllThereInTheManual character sheet]] is anything to go by, Allen is about 51 and Bonnie is about 47. They don't look it.
* ''WebComic/{{Precocious}}'': Tiffany in [[http://www.precociouscomic.com/archive/comic/2011/08/18 this]] request strip showing the kids as teenagers.
* [[AmbiguousDisorder Dina]] from ''Webcomic/DumbingOfAge''; college-aged, but about half the size of her classmates and lacking in social skills. {{Lampshaded}} when Raidah and her friends think she's a child, and later after she makes friends with Riley.
-->'''Amber:''' Dina, I think she's like ''twelve.''\\
'''Dina:''' I have been deceived!\\
'''Riley:''' Wait, ''you're'' not twelve?\\
'''Dina:''' I see no answer to that which would not tarnish my dignity.
* Magic users in ''Webcomic/{{Evon}}'' age slower than normal people. Evon looks like a twelve-year old ([[InformedAttribute allegedly]]) but is actually in her mid-20s.
* Nearly everyone in Oz in ''WebComic/{{Namesake}}''. The spell placed on Oz prevented the inhabitants from aging, meaning only those who really ''wanted'' to age did so. Ozma in particular appears very young, in her younger teens, despite being [[Really700YearsOld however old she really is.]] In a horrifying twist on the trope [[spoiler:the Dorothies don't appear to age physically, but die of old age anyway, to Ozma's despair.]]
* ''Webcomic/{{Spinnerette}}'' looks like a teenager but she's actually a grad student in her mid- to late twenties. This contrasts with "Evil Spinerette," who looks considerably older than the 16 years she turns out to be.
-->'''Tiger:''' Wow, kids grow up fast these days.\\
'''Mecha-Maid:''' You talking about the supervillainy or the ''ginormous boobs?''\\
'''Tiger:''' Both, I guess.
* Da-Jeong from ''Webcomic/TheFriendlyWinter'' is a nineteen year old who looks like a seven to eight year old. She has a thyroid condition that stunted her growth. She could have gone on estrogen to have her grow but by the time they figured out it was too late. Her mother abandoned her ten years ago because she couldn't handle her daughters disability. Da-Jeong hates that she's forced to masquerade as a little kid (including wearing childish clothing and having a kiddie bike) and no one believes her when she says she's an adult.
* ''Webcomic/SchlockMercenary'':
** As of the Credomar arc, Kaff Tagon is 49. This is brought down in particular by Elf, who [[http://www.schlockmercenary.com/2008-10-18 in this strip]] claims he's older than her dad, and yet she had a crush on him a few arcs earlier.
** Worse is Alexia Murtaugh, who's military experience stands above Kaff's, and is third only to those of Karl Tagon and Thurl.
* Mana Ryushin, from ''[[Webcomic/DHSComix Random Encounter]]'' and ''Way Back Home'', initially appears as a young child, despite having lived hundreds of years in the afterlife. Eventually she gives herself an adult body, which still doesn't look a day over thirty.