This story hits very close to home for me. In 1981, my uncle (who was 17) asked his dad (my grandpa) if he could go play pool with his friend. Grandpa said no. My uncle went into his room and loaded up his little marlin .22 and came out and emptied it into grandpa, who was sitting 12 feet away in a recliner reading the paper. There was more to the story than that, of course, they were all pretty screwed up and guilt was everywhere, but still a scary situation for me to have heard about at that age. As far as age to shoot goes, my daughter is 5 and she has her own .22 rifle. It will be my son's when he gets a bit older and she graduates to something a bit larger. Teach them young, teach them well.