25 year old being able to pass as high schooler?

I'm 31 an can pass for a high schooler.

When my cousin was 23, she was a teacher and on the first day of school, the other students thought she was also a student.

Michael J Fox was 22 when he played Alex Keaton on Family Ties, and at the beginning he was like 16 or so on the show. And Jennifer Grey was 28 and playing 17 year old Baby in Dirty Dancing. I thought she was maybe 21, but not 28!

I used to get carded all the time at 25, it was annoying after a while.

I know I could. I don't look my age (24) at all. If I don't wear mascara, trust me, I could easily be 17/18.

Totally possible. Many people look much younger for their age (myself included) I'm turning 36 in a couple months and a few people tell me I look like I'm in my early 20's.

What's funny is this movie would be even more plausible today, with the way most teenage girls do their makeup. I'm almost in my mid-20's but I see some teenage girls with better makeup skills than myself. So it depends on a lot of different things. I myself could easily pass for a HS Senior. I think everyone in that movie could pretty much pass.

only can happen if youre black or asian

I'm 43 and still get mistaken for a teenager, even a pretty teen sometimes, and I HATE it! Everyone who is waaay younger talking down to me like I was born yesterday when I'm old enough to be their mom or even grandma really gets annoying! Also, almost all teen characters are played by older actors, probably because of child labor laws. Connie on Just the 10 of us was 14 played by a 24 year old. Michael J Fox was 24/25 when he played 17 year old Marty McFly in Back to the Future (BEST MOVIE EVER MADE!!).... So yes it's very common and very believable for young characters to be played by older actors.