Then why don’t we let kids who can beat Super Mario Bros in their sleep (and thus from your perspective have demonstrated the skill required to learn how to drive) drive cars?
Well for one they can’t reach the pedals or see over the steering wheel, and the safety systems in the drivers seat are built for adult sized humans. I totally believe the average 10 y/o possesses the mental capacity to operate a motor vehicle though. I was riding dirt bikes around town at that age. Now, their risk assessment abilities might be off, but I’ve seen plenty of people way into adulthood that don’t seem to have those abilities either.