Sitcoms about high schools have often cast actors in their twenties or thirties. There's no way those classrooms had that many kids who looked like they'd been held back about a decade due to failing, well. everything, but that's how Hollywood has worked. The talent pool of believable actors who are the precise ages of your characters can be very limited, and sometimes you just want the best performer, not the most believable looking.To say nothing of how many "teenagers" we see in movies that are actually closer to 30.
Once again, this isn't a Kurtzman-specific boogeyman, just another thing that's been bog-standard in the industry for, oh, at least a century or so.





