Krisken, The Rascal comes in three draw weight peaks 20, 30 or 40 lbs. The 40# Rascal will adjust down to 30 lbs and is modular draw length adjustable from 19-25" simply by changing a module.

You may also want to take a look at the Stalker Lite. It comes in 30,40,50 and 60 lb. peaks that will adjust dwon 10 lbs. It may draw a little long at first since it comes in 23-29" draw lengths but the way kids grow now day's... You can do a little string and cable work to get it to fit him and he'll be able to use it for a long time...

Both of these bows use the same cam and are both great performers for the money...