Trevor Donovan, 90210
Old enough to remember Luke Perry playing a teenager in the original 90210? Don't worry, you're still young enough to play a teen in the remake. Donovan was almost 31 when he first appeared on the show in 2009 as teenager Teddy Montgomery.
Alan Ruck, Ferris Bueller's Day Off
Ruck's faultless portrayal of a tortured teen in Ferris Bueller may have been down to his maturity as an actor, rather than a natural adolescent angst. (He was 30).
Denise Richards, Wild Things
It might have been poor taste to let a 17 year-old loose on all those sex scenes, so they hired Richards, then a sensible 27.
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