What, the high schoolers in your day didn't look 30 years old? Welcome to WatchMojo, and today we’re counting down our picks for actors who played teenage characters on TV, despite being significantly older. Our countdown includes actors in series "13 Reasons Why", "On My Block", "Dawson's Creek" and more! Who are your favorite TV characters who don't look their age? Let us know in the comments.

Check out these other "oldest" videos:
10 Oldest Cold Cases Ever Solved:    • 10 Oldest Cold Cases Ever Solved  
Top 10 Oldest Real-Life Killers:    • Top 10 Oldest Real-Life Killers  
Top 10 Ancient Conspiracy Theories:    • Top 10 Ancient Conspiracy Theories  

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