My kids first ride at 10 months was between my wife and I at a rally in Iowa. We went around the campground at 5 mph or so. He now rides around with me on my quad with a helmut of course. When I was young (6months or so) my momma would put me in her coat in front she then would ride my dads BMW to the store or whatever, no helmuts. It was our only method of transport, dad rode to work with another guy. They were 17 years old by a couple days when I was born.