I agree with Chuck and kmon1. I just bought a Mission Craze for my grandson (he'll be 7 in July). The draw weight on the bow is 15-70 lb (they were able to get it down to 8 for starters) and the draw length is 19"-30". It is easy for him to start with and will be good for several years. It's easy for him and he loves it. Stay away from the large chain sporting goods stores if possible. An archery store is the best bet. Hopes this helps some.
Ha! I bought a Mission Craze for myself last year for my first bow and I love it. I turn 47 next January.
Seriously though I see a lot of the youths at the range I go to using Missions. Very adjustable which is a great feature for when the kid hits a growth spurt.