Personally I think some of these states are crazy with the age limits so high. I've taken my son out with me since he was 5...training him all along. When he was 9 I got him his own rifle, and he took a doe that year. Last year at 10 he took 2 deer, including his first buck. He loves it and understands what to do & not do, etc....but still remains 100% supervised. He's not ready to be out there on his own. A couple more years, maybe.
BUT....to have him wait till he's 14 or 15 to even hunt - to me that is ridiculous.Those states will probably continue to have declining hunting numbers.
Another thing - all kids come along at different rates....just because some COULD hunt at 9 or 10, doesn't mean all could. Some might be 12 or 13 before they mature enough to be able to handle it. I have a 7yr old daughter, that I am bringing up the same way as I did my son. We'll seen when she gets the nod. So far she's doing pretty good...