I've got two girls (not twins) 2 1/2 and 1.
I'm not looking forward to their teen years at ALL!
I have three kids: Two girls who are 21 and 19 and a son who is 17. I have discovered that there is nothing in the world meaner than a 15 year old girl and nothing in the world dumber than a 15 year old boy.
They do improve though.
I have 3 girls, we are just now out of the teen years. We've survived!