Good replies! Wouldn't your son be crushed if you told him he's too young? Take him!!!!
It seems to me you and your son can go hunt over here while the others go over there, right? Just be sure that you and your son can take care of his needs without the help of your friends, and tell your buddies that they don't have to tone down their language or behavior in the presence of your son. As long as they can be themselves, what do they have to complain about?