While some shows really do use teens, it's perfectly normal to see 20-somethings playing high school aged students. While it's certainly fun to see teens who actually look like teens, these older actors generally have more experience and maturity, which can be key in the high-stress, work-heavy world of TV production.
However, sometimes shows reach well beyond actors in their early 20s, even using people in their 30s to portray teens. Yes, really. Click through this gallery to see some of our fave actors who are so much older than their characters that we have to wonder if they've used magic to stay looking so youthful!