I have an opportunity to go out for a girls' night with some friends this weekend but I need a sitter for my 18mo. I don't know anyone in the area well enough (recently divorced) and my ex is working so he can't take her. Well, one of my friends said her 13yo could watch her while we go out, but I'm not sure if I'm comfortable with that? How old should a babysitter be? Do you think 13 is too young to babysit?