From Chase Stokes to Nicola Coughlin, plenty of TV stars have played teenagers years after aging out of the demographic.

In fact, shows often gravitate toward older actors to fill roles that would be hard for actual high school students to fit into their schedules. There are also certain confines that create difficulties in the casting process when aiming to include young stars.

“It’s all because of the labor laws. The number of hours that children are allowed to work are highly restricted, which limits the amount of time that producers can actually have adolescents on set,” casting director Todd Thaler told Vice in May 2017. “Within those limited hours that children can work, part of that time includes education, rest and meals.”

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However, placing older actors in teenage roles comes with its own set of issues.

Scroll to see which actors played high school students long after leaving the actual hallways: