My son was 5 when I started tooling around with him on my Goldwing. We finally got the permission slip from mom when he was 8 to buy him a bike (TTR 90), and then he moved to the TTR125 for a couple of years. He is 12 now and wants to be like dad, so he now has a Honda Rebel 250. We are fortunate enough to live in a large housing development with miles of paved roads. Hell, the only mode of transportation around here for some people is a four wheeler, so nobody complains. I can't wait until he is old enough to do the long father and son journey. By then he should be road ready.