"Glee" star Cory Monteith has become a poster boy for the trend of onscreen high schoolers being played by actors in their mid-20s. Why? It just so happens that he's the oldest of all the "Glee" kids.
BING: How old is Cory?
FIND: Check out his best 'Glee' performances
SEARCH: Is Cory dating anyone?
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