I agree. I think that 15 is too young.
Today, dh started to take dd for a drive in the Jeep, which is much easier to come off of the clutch. I'm inside, watching out the window, when it appears as if, after backing out of the driveway, and in the attempt to go forward (and lurching), she hits dh's work vehicle (as in paid for by his company). Oh no!
Dh gets out of the Jeep looking unhappy. But, she only knocked over the trash can, which was beside the bumper of his car. From inside, it looked like she had hit the car.
Dh suggested that I take her. Chicken...
She actually made it into the driveway without conking out today.
Scary moments...lots and lots of prayers.