i dont think so. im 15 and ive been playing m rated games since i had my ps1. ive tried to rent m rated games b4 and the cashier asks me for id. obviosuly im not old enough, to get it, but i play it anyways, and so do many other teens my age.
i think its the parents job to do what esrb does. kids get their hands on m or teen rated games anyways. theyll find someway