I say 18, I can't stand watching these 16 and 17 year old's with a car full flying down the road. I always get a car full of high schoolers in their riced out POS tailgating me in the Z-28 trying to get a race or whatever it is their attempting to do. I outta just pull the fuckers out and beat the hell out of them. Teenage girls on the cell phone while driving really makes me nervous too, about the same as my 24 year old wife.