Every television show has its own average age-range of competence. Only people inside that range, whatever it is, are likely to be competent at anything relevant to the show.
This holds whether you're trying to save the world or just performing A Simple Plan. If you're too young or too old, you're outside the Competence Zone of your profession, which makes you dead weight. The 'kid' is innocent or bratty, and needs protecting. The old guy is cranky and complains too much.
That sounds like common sense, but television often takes it a step further: the Competence Zone becomes a relative thing. A 17-year-old among twenty-somethings is just as much the "kid" as the ten-year-old among thirty-somethings; a 22-year-old is an "old guy" on a show about preteens just as much as the 55-year-old father is on a show about young adults. The only difference between shows is that the zone itself gets wider or narrower.
This occurs because the main cast of a series are often near the same age, as is the target demographic. We relate to them, so we can subjectively ignore ages even much higher than intelligence may indicate. However, any deviations from this become obvious, and seem to demand explanation.
If the older/younger characters are just as competent, there's usually some inherent quirky trait allowing them to be so. A Creepy Child, a Man Child, a pseudo-child and Wise Beyond Their Years are ways to play with personalities to make them fit into the Competence Zone where the writers want them to, while mascots and Team Pets have a vague enough age that you can fit them anywhere you want. Occasionally, someone is far enough out of the Competence Zone that they become useful again — grandfatherly mentors are more useful than parents, and genius pre-teens are more useful than the average high school student. This may be because authority conflicts or their notable absence are less likely to distract from the story this way. A pre-teen genius would be less likely to conflict with adult characters and demand more autonomy than a 17-year-old, whereas a grandfather would be less likely to attempt to exert control over a teen cast because it's not his job to be the strict authority figure.
Most inexplicably, if the main cast ages during the run of the show, the Competence Zone may move with them. On the other hand, if the show changes to focus on different characters as old ones move on, the original cast may slip outside the Competence Zone.
Subtropes include Adults Are Useless and Teens Are Monsters. See also Improbable Age, where the Competence Zone is imbalanced enough for viewers to notice. In a Teenage Wasteland, the characters may or may not have reached the self-governance Competence Zone. Can overlap with Protagonist-Centered Morality.
Examples of too young:
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Anime and Manga
In Love Hina, Motoko is a serious Huge Schoolgirl who's treated like the other twentysomethingers, while the meek Shinobu is treated like a kid, despite them being only three years apart in age.
Likewise Sarah's first appearances simply establish her as a Bratty Halfpint. Both the comic and show have a deliberate and funny 'reveal' scene where we notice than even the small Shinobu is much taller than her.
Future Boy Conan sets this line at around 10. The heroic kids are not only smarter than most of their adult counterparts, the title character is stronger and faster too. Once you become a grandparent you are competent again. At least until you get killed.
This seems to be in effect for Hayate the Combat Butler, everyone is within three years of 16 who is competent. The others are side characters just tossed in for humor (which of course is the point of the story).
Nagi's grandfather Mikado is old enough to be part of the circle-around mentality, except he's the one recurring character we can be sure is a villan. Isumi's great-grandmother also circles around, but is on the protagonist's side after her entrance (when she plays at being within the competency zone).
Athena plays with this one, supposedly being the same age as the male lead for her first two appearances, while Older than They Look questions are tossed about. But as of chapter 300, she's been de-aged to appear six. So it's unknown if she's competent, circles around, or stands firmly outside.
In Full Metal Panic!, all the people who do any work or accomplish anything (especially with regards to saving the day) are 16 years old. Sort of explained as most of the 16-year-olds are actually Whispereds - special geniuses born with knowledge of Black Technology, all of whom were born at almost the exact same time. Except... the explanation still doesn't cover why Sousuke, who is also 16 (and who is the most useful character (he is the main character after all)),is still a young genius despite not being a Whispered. The rest of the characters (who are older) don't do nearly as much for the plot.
However, Sousuke has more experience than some older characters. He has been a soldier since he was a child, while Mao and Kurz weren't. He is younger, not more inexperienced.
In Runaways, all the heroes are teenage runaways except Molly, who is an 11-year-old. Even though Molly has superstrength and routinely pounds bad guys with it, the other kids keep sheltering her. When they fight off a supervillain when she's out, they decide to never tell her that a villain ever attacked. However, adults explicitly note more than once that she acts childlike to lower people's defenses, and she's showed plenty of competence in her Day in the Limelight story.
The competence zone is shifted notably upwards in Game Theory from what it was in Lyrical Nanoha. While children in this story are no less capable in terms of fighting abilities, they tend to lack the maturity that comes with experience, and consequently make errors in judgement. The adults, on the other hand, get handed far fewer Idiot Balls than they did in canon.
It's also lampshaded. Characters in the story find Star Wars ridiculous for having 20-something Luke as the NaÔve Newcomer and Obi-Wan still fighting.
In the Xanth book series by Piers Anthony, the Adult Conspiracy is a seemingly magically-enforced pact among every adult in the world to prevent children from learning about sex, swearing, or nudity. Every adult human, at any rate - the rest of 'em don't seem to care too much; centaurs and demons being depicted as more carefree, for example.
In the earlier Harry Potter books, Ginny was outside the Competence Zone and in general portrayed as a helpless innocent. This is despite the fact that she is only one year younger than the trio and thus always the same age Harry was in the previous book. This was subverted in Harry Potter and the Order of the Phoenix when Ginny is allowed to help after pointing out she is four years older than Harry was during his first confrontation with Voldemort, giving her the opportunity to show that she Took a Level in Badass.
Followed confusingly in the climactic battle, where the good guys weaken their numbers by sending the under-17s away. This is justified because, well, adults don't generally like youths putting their lives on the line, and Harry and Co.'s adventures were generally without adult approval.
In The Egypt Game, eleven-year-olds April and Melanie worry about nine-year-old Elizabeth being outside the Competence Zone. She turns out to be more competent than they expect, although she's still portrayed as a NaÔve Newcomer. Oddly, they had no such reservations about Melanie's four-year-old brother Marshall, but then he is a precocious genius. (Which kids put a lot more stock in than adults do.)
Dawn is a clueless freshman when first introduced, despite being at most one year younger than Buffy was when she started killing vampires every night. Lampshaded on multiple occasions when Buffy is being protective (over- or not).
Abused by Seasons 7 and 8 when it comes to Dawn. In Season 7 she quickly goes into the role of The Smart Guy and is generally much more useful. Then Buffy tries to have her taken out of the battle by having Xander chloroform and kidnap her. She tazers him and drives the car home after waking up. Season 8 has her saving Xander's life and then later on being the only one to realize that Buffy sprouting new powers including flying might not be as good as they think it is.
Degrassi The Next Generation: Angela is a little girl of highly Vague Age, surrounded by teenagers. Her sole purpose on the show is to be a pure innocent who cannot be exposed to the typical Soap Opera nightmares happening around her; the other characters know they've gone too far when something they do affects Angela.
Drake & Josh: Subverted Trope, in which the main characters' younger sister Megan is portrayed as being more competent than most of the adults around her.
The 13-year-olds were competent, but anybody younger become a comic-relief sidekick. Particularly strange was when Gabby got too old to be comic relief, became competent, then was replaced with a younger actress who acted even more naive than the original Gabby did.
They did make this a Subverted Trope once: When Jamal's family takes Casey in, they try to keep the truth from Casey about her alcoholic mother, and this is more trouble than just telling her would have been.
My So-Called Life: 15-year-old Angela's 10-year-old sister Danielle is too young to be part of Angela's group, but does have sarcasm down....
Revolution: The competence zone in this show is set pretty high to at least 30 years old. Charlie Matheson, Nate Walker/Jason Neville, and Danny Matheson, despite being at least older teenagers and at most young adults, are treated as stupid kids who can't take care of themselves. Meanwhile, the older adults seem to have loads of competence.
Treated Jack O'Neill's teenage clone as just a kid and sent him to ''high school'', even though mentally he was no younger than the original.
Then again, mini-Jack doesn't seem too upset about being surrounded by teenage hotties who are clearly no match for his superior maturity and experience.
Alternately, he may have no intention of staying in high school. Jack probably knows how to disappear, and who would think a fifteen-year-old actually had the memories of a fifty year old special ops officer?
Metal Gear is notable in that it has a much older cast than usual in video games or media in general - much of the cast is in its thirties or forties or beyond. The result is that the Bishōnen, in his mid-twenties, falls outside the Competence Zone and becomes This Loser Is You. Until the fourth installment, where he goes cybernetic Bad Ass on us.
Played straight, almost to an extreme in Final Fantasy IX in regards to the six-year-old Cheerful Child and summoner Eiko. She is equally as capable as her older comerades in surviving and tackling dangerous situations head on, and garners her Precocious Crush on the sixteen-year-old Zidane with poetry, cooking, and quoting classic literature. To top it off, when two members of the group go into a Heroic BSOD, Zidane puts Eiko in charge. If Eiko was the same age as Garnet, Zidane's actual Love Interest, it would be highly likely that some serious shipping would ensue.
In the webcomicQuestionable Content, most of the cast is in their early-to-mid-20s, but Ellen first appears just before her 18th birthday. Sometimes she's as competent as the rest of the cast, but she has her moments, like not knowing (in a discussion of porn) that it's considered unusual for a girl to do double-penetration with her boyfriend and some other dude.
Jade from Jackie Chan Adventures is considered too young to fight against forces of evil, or anything for that matter, not that this actually stops her of course.
In Recess, the Kindergarteners are portrayed as wild savages, and the adults are generally clueless. Older children like the King and his guards are often so concerned with their own power that they're incompetent rulers.
In any company which requires selling something, particularly a form of credit or anything else a bit financially risky or important, a customer is far more likely to trust and therefore sign up with an older person, even if a much younger person uses exactly the same selling-pitch.
In many white-collar professions (e.g. law, medicine, architecture) the sheer amount of education, practice, and accreditation required mean that it's difficult or impossible for a young person to be preeminent in their field. There are aversions based on specific aspects of some professions, though, i.e. surgeons are at their best before they lose their reflexes and fine motor control.
Examples of too old:
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If most cereal commercials (namely Apple Jacks and Cinnamon Toast Crunch) are to be believed, adults are the biggest morons on the planet and don't understand anything and just exist to be scorned mercilessly for their idiocy by their children. They are also physically incapable of grasping why children enjoy cereal.
Cheerfully blown to pieces by Magical Girl Lyrical Nanoha. Where most magical girls lose their powers as they grow up, Nanoha's ability to blow shit up only gets bigger and flashier as she goes from a pre-teen in the first and second series to an adult in the third and a mother in the fourth and fifth.
Not totally averted, tough. It's implied that Nanoha effectively lost part of her power as a consequence of constantly pushing herself beyond her limits as also her age, in FORCE she uses a lot of support equip to be able to keep up fighting. Also played straight on the same season with the Wolkenritter, their fightsyle, weapons and powers are simply too outdated to keep up with modern threats and are easily defeated as a consequence.
In Ranma 1/2, nobody between the age of 19 and 100-300 is worth crap — except Dr. Tofu, who vanished without a trace early on. Ranma's father, though one of the most powerful martial artists in the series, is a coward, a leech, a bully, a criminal, and much more. Akane's father is better, but he's still a an emotional wreck who lets people use him. Principal Kuno is... one of a kind. None of them ever accomplish anything on their own; the teens have to do it. (The senior citizens, Cologne and Happosai, are just as messed up, but they're actually competent.)
Let's be fair. Ranma and friends are pretty messed up too.
Let's not forget Hinako Ninomiya — biologically in her late 20s, even if she's only that way outwardly (and mentally) half the time. She'd actually be pretty deadly if that were her aim, but all she really wants is to teach... which is a job she performs marginally better than Principal Kuno does his.
In Naruto the zone is similar. If you're a twenty-sixty something adult ninja, even if you have years of experience, you're nothing but a mook. Even if you are competent, it'll just be used to hype up the bad guy so the kids look better when they win.
Although the few characters who are genuinely getting on in their years (Onoki, Hiruzen, Madara and arguably the sannin) tend to be just as, if not more, competent than the main characters. This makes sense in context though, because there's not many elderly ninjas around; those that do show up are the ones competent enough to actually survive to old age.
Subverted with the Tower-climbing Regulars from Tower of God. They all appear to be in their late teens and early twenties, but in a weir case of aging, a 300 year-old girl can be the niece of a 18 year-old princess, yet they have about the same level of maturity.
The tween heroes from Digimon Adventure are apparently too old to save the world in Digimon Adventure 02 — even though only three years have passed. Sure, they show up as cameo characters, passing on knowledge or goggles to the new heroes, but with the exception of the two youngest, they make a big point of not participating in the struggle. The big justification here has more to do with the fact that they're simply too busy to do so now that life is catching up to them; hell, Mimi doesn't even live in Japan anymore.
It is soon explained in the series itself that it's more the fault of their partner Digimon than the kids': they can't evolve at all with the Digimon Kaiser's Dark Towers around, so they are worth shit in a fight... hence the new recruits.
They do eventually get rid of the black towers, but the original characters are still limited to cameos.
Except near 02's conclusion, where the older kids travel the world with the younger ones.
As soon as the Dark Towers were destroyed, there was a flashback explaining about how the Adventure characters gave up their ability to evolve to the Perfect level sometime during the Time Skip, so even if there were no Dark Towers, as soon as Ken figured out how to control Perfect-level Mons, they would have been toast anyway. The fact that this wasn't mentioned until the series was half-over makes it come off as an easy, spur-of-the-moment contrivance to justify focusing on Daisuke and the others at the expense of the older kids.
Which in itself would be a fairly standard Bag of Spilling to let the new characters be useful. But they are too old to even try to get their powers back.
Don't forget Digimon Tamers, where this trope is utterly skewered since many of the adult characters become extremely important characters (as in absolutely integral to the final battle). They aren't out on the front lines, but they are arguably the most helpful non combatant characters the franchise has seen thus far.
And Devil Hunter Yohko is the same — Yohko and her grandmother are both Devil Hunters, but Yohko's mother is a boozy slut who didn't want to take on the family duty to fight supernatural monsters and disqualified herself as quickly as she could.
With the exceptions of Run-Run and Sly, anyone significantly older than Kukuri and Nike in Mahoujin Guru Guru is downright useless. The Old Kita Kita Man is practically a millstone as often as he's useful.
Neon Genesis Evangelion is a rare case where nobody is in the Competence Zone. The older generation has both brought ruin upon the world, and left the younger generation too emotionally crippled to fix it.
Strike Witches' competence zone is basically ages 12-18 - its a major plot point that the oldest member of the team is losing her powers.
In Soul Eater prior to taking their various levels in Badass the kids were clearly outclassed by their teachers. Now, groups of students form an 'elite' unit who apparently outperform the average adult Shibusen uniformed mooks, and the adults previously shown as competent have recently been worfed in the space of a page or two.
Subverted in Tiger & Bunny, where middle-aged Kotetsu T. Kaburagi manages to be deceptively competent and extremely heroic despite his frequently lampshaded "past his prime" status. Word of God says that the character was basically created to give the typical anime competence zone the middle finger.
Comic-book example: Ultimate Spider-Man is very deliberately based on this. The main theme of the story is that adults have all screwed up the world, and the teen-age Spider-Man, who barely understands what they've done, has to do his best to fix it. At one point, Spider-Man directly tells the reader this in a monologue.
Similarly, in Runaways, when he feeds the "With great power" line to the titular characters, Gert scornfully remarks, "That's inane. Most people in life never have great power, and the few that do are almost never responsible with it. The people with the greatest responsibility are the kids with no power because we're the ones who have to keep everybody else in check", to which he replies (totally deadpan), "Wow. You are totally gonna be an Avenger when you grow up."
Happens in the Legion of Super-Heroes to various degrees, in the first years of the original, in the reboot, and in the threeboot, with teenagers being the only superheroes in the setting and R. J. Brande as the useful old mentor. Especially so in the threeboot, with the Legionnaires being on the forefront of youth rebellion throughout the galaxy and where Supergirl in the Legion was noticeably more mature than she was in her own book because she's not in the Competence Zone there. (In the current version the Legion has aged enough that the Competence Zone is just "adult" and not noticeable.)
Super 8 seems to suffer from this, with many of the children having adult competence levels and developed skills, and most of the adults (except Jack) just following direction. And the young adults are potheads.
A Series of Unfortunate Events, in which every single adult (with the exception of Count Olaf and the Snicket siblings) is much, much less competent than infant Sunny.
Even Count Olaf isn't exactly competent by himself, it's just that he has a lot of resources to work with and usually only has to fool incompetent people. This becomes most apparent in the final book where his usual Paper-Thin Disguise doesn't fool anyone.
Anyone not in the inner circle of Animorphs, though this makes sense, as the inner circle have the most experience fighting the Yeerks.
In The Great Brain books, boys start leaving the Competence Zone around age 13, when they start working and develop an interest in girls and therefore have less time for kids' games.
The short story "Age of Retirement" by Hal Lynch (published 1954), had the Space Patrol mandatory retirement age as sixteen. (What saved it from being a horror story about Child Soldiers was that the weapons used by cops and "afflicteds" alike were all nonlethal.)
"The Patrol's found out that after your fifteenth year you somehow 'put away these things.' The glory dies away, as new yearnings come, until you find yourself a stranger to what you used to be. So the Patrol makes you step down before you reach that point, Tommy."
Apparently, except for Mazer Rackham himself, nobody over 12 is competent to command in the Enderís Game universe. The books justify this by insisting that these kids are the first generation to be put through Battle School, where they are raised to think tactically all the time. Also this doesn't make older people incompetent - they're just using the children's special abilities in an all-out war. There are many types of leadership and competence.
Live Action TV
In Degrassi The Next Generation, no teens more than a year older or younger than the main cast even exist. Every adult on the show who wasn't a kid in previous ''Degrassi" series is either a Spear Carrier, incompetent, evil or all three. Those who were there before are in the zone despite what the current generation think. ("My mom's cool but she's not that cool.") All university students (except the main cast, once they go to university) are competent and evil.
Despite some episodes of Buffy the Vampire Slayer where Giles is referred to as the useless old English fuddy-duddy like when he tells Buffy she will die in the season 1 finale, he uses his magical know-how to save Buffy's life in episode two, so even though he's probably older than her mother he doesn't fit this trope. Joyce Summers, however, fits it perfectly because Buffy keeps her from knowing about the slaying, as does Principal Flutie.
Wesley is a subversion as a young(er) person who's painfully outside any zone of competence (at first).
Really, he was outside both competence zones. He was outside the 30+ one (Giles, Angel, Jenny when she was alive and all of the Big Bads) but outside the under 20 one. The under 20 one moved upwards over time while the other one stood still.
Parodied in an episode of How I Met Your Mother, when Robin has a 40-year-old boyfriend who the narrator admits probably wasn't as outrageously old as the group imagined. In the show, the 40-year-old is played by a man in his 60's to demonstrate the exaggerated imagination.
Extremely common in many videogames, most especially console RPGs, from the Grand List of Console RPG Cliches:
RPG characters are young. Very young. The average age seems to be 15, unless the character is a decorated and battle-hardened soldier, in which case he might even be as old as 18. Such teenagers often have skills with multiple weapons and magic, years of experience, and never ever worry about their parents telling them to come home from adventuring before bedtime. By contrast, characters more than twenty-two years old will cheerfully refer to themselves as washed-up old fogies and be eager to make room for the younger generation.
The Tales Series as a whole has a fairly narrow competence zone, usually between middle/late teens to early twenties. Most of the playable cast will fall between these ages (and good luck with any of the non-playable cast doing anything to help you save the world), although there are exceptions:
Yet another game in the series, Tales of Vesperia plays it straight with Raven, 35 years old, being called an "old man" and constantly whining about his age.
Similarly, Malik is a 40-year old travelling with a bunch of kids mostly in their late teens. Nobody else his age is shown to be doing all that much to help avert the end of the world.
And way before all of the above, there was 29-year-old Klarth in Tales of Phantasia. Many old man jokes were had.
Handled with unusual specificity in Final Fantasy VIII, where nearly all the principal characters are 17, except for Quistis, their instructor, who is 18.
Although, Laguna and his friends Kiros and Ward are in their 20s-30s and are shown to be very competent soldiers. Yes, even Laguna.
Mostly followed in the Golden Sun series (most party members are in the 15-18 age range, except for Kraden, who doesn't take part in battles), but averted in a few cases; Piers in The Lost Age is hinted to be considerably olderthan he looks but refuses to give a straight answer about his age, and Eoleo in Dark Dawn is in his thirties.
Surprisingly averted in Infinite Space, considering how heavily anime-influenced this game is. Many of the "old" characters (including your crew members) are just as competent as the "young" ones, if not more.
Justified in TCT RPG as all the adults are being puppeted by the Others. Only children can actually think independently.
.hack averts the trope. Yes, a lot of the main characters are teens. However, in the first four games, we also have three adults (Helba, Lios, and Mistral), and one pre-teen kid (Wiseman), all of whom are thoroughly competent, and play major roles in the story.
Ozy and Millie plays with this by featuring several very childish adults, in contrast to the very grown-up children it stars. However, that only makes up about half the cast. One of the main themes of the strip, as stated many times by its creator, is that maturity often has little to do with age.
A subversion of this serves as a primary plot point in Golden Age Of Adventurers. The four older adventurers really are past retirement age (and therefore supposedly not capable of really looking out for themselves, let alone going on adventures). However, for the most part they are very skilled at what they do and can get along just fine.
Averted in Homestuck, in which the main characters' mentors are increasingly revealed to be very capable and it's implied they had their own plan to stop Jack going on in the background. It takes Jack becoming a Physical God to overwhelm and kill them, but in fairness, he's perfectly capable of killing the heroes too (and has already).
One of the main thrusts of South Park is how the 3rd/4th grade main characters are more competent than adults because they have yet to be indoctrinated into various foolish aspects of adult American culture. Kids who are a few years older than the main cast are shown to be dominated by their adolescent hormones, while younger children are little more than babies.
The Life and Times of Juniper Lee has a mystical gift jump a generation. June and her brother are competent, her grandmother is competent, but her parents are clueless.
Which is almost identical to the setup in Jake Long: American Dragon, only swap the genders (Jake and his little sister, and his grandfather are dragons) and make one of the parents clueless (Jake's mother is aware of their family heritage). Once his dad finds out about everything, he becomes pretty competent, singlehandedly wiping out an army of shadow demons that even the whole dragon council was having trouble with.
Ditto with Hay Lin's family on W.I.T.C.H. — her grandmother is a Guardian, she's a Guardian, her parents are just clueless. The other parents on the show are decent but stupid.
Not stupid, per se, they're just fairly good parents that don't know their daughters are saving the world when they break curfew thanks to the Masquerade. If they were stupid, it would actually make things easier on the girls.
Codename: Kids Next Door takes the Competence Zone to extremes: anyone 13 or older is a threat to the Kids Next Door, and must have their memories of the organization erased. In this universe, unlike the real one, teenagers serve as loyal minions for adults. The show eventually subverted this in the episode "OP MAURICE."
Occasionally subverted. Especially when Hogie runs to his own mother for help dealing with The Common Cold. She proceeds to save the day
Alternately, one could say being a KND operative, current or former, is the competence zone.
Avatar: The Last Airbender : another great kids' show featuring use of child soldiers in a genocidal global conflict. The main cast of teenagers range in (biological) age from 12 (Aang, Toph) to 16 (Zuko, maybe Jet?). Owing to many members of the intervening generation not beingaround, competence doesn't appear to pop back up until you start hitting the much older demographics.
Jet is about Zuko or Sokka's age, which isn't so bad until you realize he's been fighting the Fire Nation since he was much younger than the current cast of heroes, and has apparently gathered an entire following of children a la Peter Pan's Lost Boys. Smellerbee and Longshot are probably teenagers, but The Duke is 8. He seems to know a fair bit about explosives.
Averted with The Legend of Korra. Most of the cast is in the 16-18 range (Korra, Mako, Bolin, Asami), but then there's the older generation (Tenzin, Lin Bei Fong) who can kick some serious ass, and then there's the really young kids (Tenzin's kids; Jinora, Meelo, and Ikki) who can take out the Lieutenant and a squad of Chi-Blockers single-handedly. Rule of thumb is that if a character has a backstory, they're competent.
In Arthur, the adults are realistic enough, but fourth graders (a mere grade above Arthur and his friends) are portrayed as "tough big kids" who essentially act like teenagers and are often not too bright. This is heavily based on how Binky Barnes, who is their age, is portrayed in the books.
The Fairly OddParents tends to play this pretty straight, with Timmy's parents being stupid and impulsive. However, Timmy comes to lampshade this during the event where he chases Vicky through various TV shows, all which also include incompetent adults, including a grown up, time travelling, secret agent version of himself.
Largely averted in Kim Possible. Our heroes are teenagers, but their allies and enemies include tween geniuses, adults ranging from scientists and law enforcement to Mad Scientists and Kim's vast network of favours, and a ninja toddler.
Played with in Young Justice. The main protagonists are teens (early twenties by Season 2), and are clearly shown to be nowhere near as strong and skilled as the adults in the Justice League, suggesting that they're barely not "too young". Despite this, the kids are the ones who deal with the Light's plans, and most of the time the Adults Are Useless, amidst the machinations of the villains.
Any job description requiring sex appeal.
Olympic level gymnastics.
To a certain extent, mathematics. Exceptions exist, and the increasing amount you have to learn is slowly forcing people to push the limits upwards, but historically the vast majority of mathematicians had their productive years before around 30.
To a certain extent, science. Most work, especially experimental or programming, is done by Ph.D. students or postdocs that are in the 20-30 bracket. Older researchers are not incompetent, but they are overwhelmed by the bureaucracy or ignore the new techniques.
The military, especially aviation. During the World Wars, pilots were almost invariably in their early twenties at most. There are mandatory retirement ages, and if an officer hasn't been promoted to a given rank by a given age, he never will be.
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Table Top Games
In Changeling The Dreaming, characters are divided into three age brackets to represent pre-teens (Childlings), teen-to-early-twenties (Wilders), and past twenty five (Grumps). New characters derive three critical stats based on their age: Glamour, or Magic Points, Willpower, and Banality, the game's loss of magic power. Childlings not only have to deal with all the restrictions of being kids, but they have untenable low Willpower scores. However, since magic is fueled by imagination, a Childling has an unbelievable amount of Glamour as a starting character. Grumps are too Banal (which eliminates your character) and have very low Glamour, though at least they have a decent Willpower and won't have to quit the adventure because it's nap time. Wilders - either high school age or early twenties - offer the best trade-off. Their Banality and Glamour scores are better than Grumps and their Willpower scores are better than Childlings, plus the World of Darkness is not the kind of setting for Free-Range Children.
Dungeons & Dragons and Pathfinder adjust the ability scores of characters based on age, with physical scores falling as mental scores rise over time. As a result, characters who value mental scores more than physical scores actually are most competent when they are older, while physical characters are at their best young. There are exceptions such as class abilities and magic which can screw with your apparent age.
Also averted in that the classes do not allow characters to be created below a certain age in many editions. Generally, the more education the class seems to require (such as Wizard), the older a character must be at creation. The Kid Hero really doesn't exist barring Rule Zero.