What's the youngest age that a highschool teacher can be? I'm thinking mostly about drama teachers, sports teachers (school team's coaches and managers) and substitute teachers.
Is it possible to be 18 and still in highschool? What about 19?
Thank you very much for your time
ETA: Thanks to everyone who answered, I have everything I needed. I wanted to thank everyone in comments, but then I realized I would've just repeating 'thanks' all over, so an eta seemed better.