got my first BB gun at 9 or 10.
I used to take plastic sheeting, and add it to the inside of my 1/35 scale plastic tank models then see how many pumps it would take to penatrate the armor.
You can shoot spit balls out of some BB guns. (singleshot ones)
was great fun for me an my buddies, and no one ever called the cops.
I got the cops called on me for a compound bow once, but thats cause my sisters idiot BF shot the neighbors house with it.
I also got my first .22 at 12 I think. But had shot guns before that.