I am now ... ug.... 50... When I was 15 my parents were autocrossers that insisted that before they would allow me to drive on the street that I had to perform to their satisfaction at an autocross school. I have been autocrossing every since. My daughter autocrossed before she could drive on the street, and I think every kid should go through autocross training BEFORE driving on the street. It makes them a better driver on the street and makes them less agressive street drivers, because they get a certain respect for the limits and they get their jollies out on the track.

I HIGHLY recommend taking him to an autocross or better yet an autocross school. Check out :

http://www.autocross.us/forums

and

http://www.tidewatersportscarclub.com