I can hardly wait until my daughter (almost 4) is old enough to train up. Got a son on the way, but it'll be a few years for him too... My father started me at 7, seems a good age to start in with some basics.
Who knows, maybe by then I'll have gotten around to adding some Class III toyz to my "tool chest" as well.
It is a real comfort to know that yer lil' goblins can fight back against life's real goblins.
Including those who use the First Amendment to trash and misinterpret the Second.