Never yet bitten by a Ball python, young or old. If I ever do get tagged, it'll either be by a young hatchling when I get into breeding, or by my pissy male het albino. He hasn't even bluff-struck yet, but he flinches and hisses whenever he's bothered or touched, so we shall see.
I have, however been tagged by an adult corn snake.The shock of actually being bitten bothered me more than the bite.