That's the reason that where I live its 18 (I thought it was 21 but now I am re-thinking it to 18) - because they look so damn real. If you have a gun and a cop see's you with it, mostly if its being pointed at someone, he cannot tell if its real or not, and he might shoot you. I checked the law on that, and if your commiting a crime with an lookalike, they treat it as if its a real gun and you could get charged with the full penalty of it (I forget the exact charge).
Anyway, I am happy! I somehow, amazingly, extrodinarily, got my parents to let me get one!
Zombie, I really don't know why you say that you can't target practice with them, because thats completely wrong. And you can play with them. If your friends and you have them, of course you can have gun fights and stuff! They even have paintballs for bb guns. I wouldn't want to play with the metal bb's - but w/e. I don't know about killing a human, but you can hunt with them (most cannot but it is possible) - of course if you are going to hunt with them, why not buy a real gun...