Growing old . . . growing up

It's so weird to work with Tia (15) and hang out with Chelsea (17). There is such a difference in those ages. So much growing up to get done. It's also weird, because I thought I was wise, old, mature at those ages, but I wasn't. Why did I ever have a boyfriend when I was 15? And how am I going to explain to my daughters that even though I did and turned out fine they shouldn't?