The youngest shooter I have seen was shooting skeet around a year ago. I think he was six then but I'm not sure. He would borrow his grandpa's 28ga o/u and usually break 20 out of 25 clays. I can't even do that with a 28ga! His gandpa told me that when the boy was four, he bought himself a .410 with his Christmas money. So if you wanted to start a kid really early, I guess it dosn't matter, as long as they like to do it. But I would personally stick with the 8-10 year olds(or more) to teach.