I was driving our farm truck on the road at age 14 in Calif, solo. Used it to get to my part time job when weather was bad and didn't want to ride MC.
I think it's good for the kid to shake off the nervousness and be comfortable driving. My kid was up for the task, first had to break the habit of using both feet in an auto car. Myself at land office renewing my license and at the reaction test, I was surprised at the number of adults using left foot for brake.