Have you ever tried to guess her age? If you do, you may get this dirty look that tells you: "Don't even try; I'm stronger than you and you know it...". But then you would usually get the disarming smile and she'll tell you, just like every year: "Twenty Nine". Most people don't realize that this is actually true ! Just another weird case of the "Benjamin Button" symptom. For all of us it's very comforting to know that, even when we'll be old, we'll still have a loving, funny and cheerful 29-years old friend.