Our grandson rides motorcycles. He's six. He started riding when he was four. He had already mastered four-wheelers so they put him on a motorcross. His not yet four year old brother rides too. They invited us to a race and I stood there with my mouth gapping open. Where have I been all these years? I didn't know 4, 5, 6 year old kids could do that!! Aren't they supposed to be in the sandbox playing with little trucks and cars?