It depends on the child. My wife and I teach shooting classes for kids. The cutoff for the club where we teach is 10. Some of the kids at ten are still not mature enough to take the course. Yet our son was shooting at the age of five. He shot grouse, then helped clean them, cook them, and eat them. He shot his first Moose at the age of eight. Again he helped clean it, cut and wrap it, cook it, and eat it. He shot his first Black Bear at the age of eleven, and a Grizzly at twelve.
But today he is seventeen, and I can't get him to go into the woods with me for nothing. Hockey, weight lifting, and girls, mostly hockey.