Can never be too safe with parenting young kids. Even though I was watching South Park and Scarface by the time I was like 8ish, I think I turned out okay. With that said, the older I get I realize that maybe my friends and I were a little too ahead of ourselves. I see kids my brothers age at 15 and they feel so young and immature whereas some friends of mine had addiction problems by then. Puts things into perspective I suppose.
It's not a dumb question because you care about your kids! Buuuuut... I haven't played the game :S