It’s a combination of two big factors. First, there are laws about how much an actual teenager is allowed to be working versus going to school. It is much more difficult to film a TV show where you have a time limit on how many hours a day the teenager can work. So in that situation, it’s easier to get an older person who looks young to play a teenage part, because they won’t have the same restrictions and regulations that an actual teenager would.
The second is the belief that a young adult actor will have more experience and be easier to work with than a literal teenager.
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