Children and aging

So I had a friend over for a play date. (To clarify, it was the children that were playing, we the parents, were working.) She saw a picture of me, when I was a fourteen, holding a baby. She looked closer for a moment and then asked if that was me with my baby. I said no, I was fourteen in that picture! And she responded with "Yeah, you looked younger, but I mean, I know that being a parent has aged me. . ." Wow! I can imagine it now, having a baby ages you twenty years.