:( Bicycles will be next...
Don't let any of them see these statistics.
http://www.helmets.org/stats.htm
I have been operating motorized vehicles since I was 8. Mini-bikes and motorcycles. I am 45 now. My grandpa showed me how to drive an old ford pickup with a 3 on the tree, out in his pasture when I was 14.
I have been in a few wrecks over the years, but fortunately nothing real serious. I truly believe that it is because I started so young that it has taught me to be a better driver/rider. I started my son a little later, 10. It is rough sometimes watching him make some mistakes, but I would rather see a few minor mistakes now in the dirt than a major mistake on the road because he started riding so late.
I hope that legislation doesn't pass! (It sounds like an insurance company conspiracy to me.)