How old is a senior in high school? And some more questions on American schools...

Anonymous
As a girl from the UK, I don't understand how American year groups work. So how old is a senior? 17? 18?

I watched Love at First Hiccup the other day, and the boy in the film was a freshman and people kept saying he was 15. But then at one point he started driving a car. I know it's a film and such but can people in America actually drive at 15?

Also, Anya, the girl, was a senior, which is the last year of high school, but he was only a freshman so just starting the school (right?) so yes, movie, suspend disbelief, but is it common or rare for a senior and a freshman to be together in real life?

OK, thanks for any answers :)
How old is a senior in high school? And some more questions on American schools...
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