I would wait until 12 or so. Physical size is important, but even more so is mental maturity. Of course, when you hand any kid a firearm, you are making a critical statement about their capability and your opinion of his/her development. Everyone is a little bit different.
Agreed. Big part of why we're taking our time on this. We were at the archery range with our Cub Pack the other night, shooting recurve bows, and he pointed at the guy beside him while loading a couple of times. Not on purpose, but not thinking either.
He's not quite there yet.
I'm shooting air rifles with Troop next week, and he's invited. I'll bring him to at least watch, and we'll see how it goes.