Teenagers want to drive. They want to speed. They want to tail-gate. It would be very hard to beat that out of them before they get in a car.
Well, do you know what I see? Parents who buy them a car as soon as they can get a license, so they don't have to drive their kids around!!
Used cars are incredibly cheap, compared to the percentage of income they used to represent.
I know of one family who got their athlete son a "hardship" license at 15 so he could make all those practices and could maintain a girlfriend. He ran into a bank at night in the fog (this in a state that does not allow night driving until 17)--break my heart. Wooden cross on the bank and a "in remembrance" on the back window.
The parents don't like all that driving they'd have to do. The parents like the early driving ages.