Speak for yourself. I'm only 33. 
Seems like just yesterday we were too. Most accurate thing anyone ever said regarding kids was "enjoy everyday, because they will be gone quicker than you think." I'm sure we still had dirty dippers in the waste basket when the last one left for college, and now she has her degree and getting married.
Don't waste your time blinking ... Just throw the calendar away and accept the fact you are aging fast.
However, being old doesn't mean you can't shoot guns, ride motorcycle, drink heavy or even ride the bull!