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Cory Monteith Is 30? The Oldest Actors To Play Teens

04/09/2013 09:31 am ET

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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