Cory Monteith Is 30? The Oldest Actors To Play Teens

He's HOW Old?!
LOS ANGELES, CA - JANUARY 27: Actor Cory Monteith arrives at the 19th Annual Screen Actors Guild Awards held at The Shrine Auditorium on January 27, 2013 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)
LOS ANGELES, CA - JANUARY 27: Actor Cory Monteith arrives at the 19th Annual Screen Actors Guild Awards held at The Shrine Auditorium on January 27, 2013 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)

When Cory Monteith made headlines for his recent decision to enter rehab for substance abuse treatment, some were surprised by certain details of his personal life ... for example, his age. While Monteith has played a teen for four seasons on "Glee," the fresh-faced actor is actually one month shy of his 31st birthday.

But Hollywood has a fine tradition of casting actors in their 20s and 30s as teenagers. Here are 25 stars 25-and-up who've gone back to high school onscreen.

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