4 and 2 or 15 and 13?

It's official - our kids are 2 and 4, going on 13 and 15. Nathan's favorite phrase is "oh man" and Sarah just said to me last week, "duh," with all the inflection of, "are you kidding me?" Needless to say, we had the conversation that there are some things that you don't say to grown-ups so now, she's constantly asking if something is a bad word, or if she can say that to grown-ups. At least she's asking, but do not say "Oh my God" around her - just ask Sarah's Cousin Erin and her roommate!