I agree with some of the people on here, let your kids enthusiasm be your guide. If he is super excited and wants to go all the time, he will show you what bike he wants to ride, and you can always spin laps on someone else's bike that you know. If he is only so so on it but has some interest, just make it fun and let him go his own pace. My youngest likes to ride a little, and looks forward to a few rides a year, he is concentrating on other sports for now. I don't want him to get hurt or burn him out, so he can go when he wants, I'm hoping for the late bloomer who will be hooked for life so I have someone to ride with. My dad (at 73) is riding more hours per year than I am at this point, because I'm so busy with my kid's other sports, but he is only young once and I still have the rest of my life to keep riding as much as I want. Stick and ball stuff will die out once he gets to college and then hopefully his light interest in dirt bikes will allow us to ride more. At least my kid isn't whipping me on the track!!!!