If you are on a place with loose management rules and no AR. I'd say younger. That was the situation when I was growing up. I was hunting by myself around at 10-12 I guess. If your lease has strict rules I. Which bucks can be shot, or you have AR, I'd imagine by by 14 or 15 most kids who have hunted their whole life will have a pretty good handle on it.
The very atmosphere of firearms anywhere and everywhere restrains evil interference. -George Washington