Boy, 12 years old is tough. They grow so fast. I got my son a micro midas at 12 and it lasted him about 6 months before he grew out of it. I work at a pro shop and have sold alot of bows to kids his age. Depending on his size he is probably going to be to big for the Alpine Achery, or Browing micro midas, if not they are great bows,, with alot of draw adjustment. The parker buckhunter is a nice bow and has module replacements for draw length adjustments. It is also a full sized bow. They come in 40-50, 50-60,60-70. I hate to tell you to buy a bow at the bottom of its draw weight, but you may have to, to get him into something that will last a while. Her ia a list of bows you may want to look at.

hoyt rintec
hoyt ultrasport
parker buckhunter
pse spider
pse shark
alpine archery
browing micro midas
Hoyt sierratec

Go to a good pro shop and let them help you. They have alot of experience and may be able to give you some suggestions on a good fit.

good luck

oh, i forgot the 2004 renegade sbc
they give you a second set of limbs free once. I'm not sure if they still make them, but you might want to look into it.