Let them have a somewhat older car, get used to driving more. It will build ability. It will build CHARACTER.
Then when they're a little older, they'll be more capable and responsible as a driver.
Driving a car reveals one’s character.
I had an old Chevy 6.
Drove on dirt roads. Had to dig myself out when I got stuck.
If I started to slip in the dirt, it was me and the ditch, not some family in the intersection.
I learned to ‘ride it down’, not give up and release the steering wheel.
Drove in snow. Slide off the road. Figure it out how to get back on the road.
All the above gives real driver experience. Not available to 155 Corvette kids.