I just bought a Mission Menace for my 10y.o. (17"-30" dl, up to 50lbs. dw), but that is because we didn't have the money to get him a Mission Craze, which is new this year. The Craze has 19"-30" dl, and a huge range of draw weight. For example, at 25" dl, the Craze can go from 26lbs to 70lbs. My pro shop can get a bare bow for $260. If he has a good rest and sight, then you won't need to buy a package.
If he does decide to take up bowhunting, it could very well be the only bow he needs into adulthood.