Austin IS 13

OK so my first natural born child,Austin, is 13 today.Yes I know I have Heidi who is 16, but I didn't feel old when she turned 16. I think it has something to do with the fact I gave birth to him. I can keep telling myself I am really not old enough to have had a 16 year old. Well, I cant tell myself I am not old enough to have had a 13 year old, because I did. He has become taller than me, I know that is not hard to do. He has a deep voice now. He has become a man right before my eyes. I feel so old!! I can't believe I have 2 teenagers. How can that be? Seems like just last week I was 20 years old having my first child on this very day..Where did the time go? It is true when people say before you know it your kids are all grown up..