It's not how old you think you feel, it's how old she thinks you look!
Clue - she's thinking closer to 60 than 20.
Incidentally, for me it's 37. Quite how that happened I don't know. It seems like only yesterday I was doing my GCSEs and wotnot.
Inside, I feel about 25. Until I meet some 25 year olds, then I feel about 70.
I'm 34 and generally feel about 18 although sometimes, when I hear the right trigger word, I snigger like a 12 year old.
We've had my 21 year old cousin staying with us for past two weeks and, lovely as she is, she hasn't half made me feel old. She's even managed to make me consider whether I'm past living in a city like London. Out drinking every night, and every lunchtime, and not showing the slightest sign of it. I went out to a club with her on saturday and, literally, spent all of sunday in bed and then on the couch.