Good questions turbo,
My step son is 13 and has had a very slow growing interest into hunting. While my two younger daughters are counting the days until they get to carry a rifle in the woods. I had to take baby steps with my son, we started out grouse hunting. That was a huge success, He now loves to bird hunt. Then I took him turkey hunting and we had a blast. Kids are smart, I'm letting my son make the decisions weather he want's to hunt or not. As much as I would love to see him shoot his first deer, I will have to wait until he is ready.
If I could give any advice I would say don't pressure your son to pull the trigger. If he does or doesn't want to then let him make that decision.