I finished my BA at 35 and my JD at 38, it is indeed, never too late. In fact, for me, going back to school a little older was a blessing for me, I had more focus, I had an idea of what I wanted to get out of it, I valued it more than I did as an 18 year old.
Our brains don't even stop growing until were 25 or thereabouts, so it's unrealistic that a 17 or 18 year old is going to know who they are or what they want to do.
Good luck at school. I love this story!