What if you're not a student, but not an adult either?
I remember reading somewhere that FIRST drivers could be no older than 18 or something. Pre-full time college student, so someone can be a driver still even if they're taking a college class or two. If you have questions, ask FIRST and they'll be nice and clarify things; I had to do this in FTC.
But the coach can be any age! There is hope for me yet!