Minimum Age to Drive Buggy/Cart?

As long as it is on private ground and not on a public road, there is no legal limitation here in Germany. There might be regulations due to insurance, but that would be up to the insurance company. There is family at our course, where the parents both play golf, but their daughter, who is maybe twelve, doesn't (or at I have never seen her play, she might be part of the junior practice group, though). But since the parents can't or don't want to leave her home on her own when they play, they usually bribe her by renting a buggy for the round and letting her drive. She loves it. And I recently thought what a great kind of preparation that is. I think she will have much less trouble learning to drive a car later. A bit like those kids who grow up on a farm and start driving the tractor on the fields as soon as they can reach the pedals.