I'm 49, will be 50 next May. I've never thought of myself as old, or even middle age. Im still in pretty good shape, have all my own hair with only a few grey ones and im only 20lbs over where i was in my 20's. Sure I've got aches and pains, can't climb a flight of stairs without my knees and ankles cracking and snapping like a bowl of rice crispies. I never thought I was old.......until last summer. I was at the beach with my kids. My 15 year old was reading twilight. I picked up the book and started to look through it. Not a bad story so I started to read it. Shorty after a group of teenagers were walking past me. I heard one of them say "look at the old guy reading Twilight". I looked around me to see who she was talking about when I realized it was me, I was the old guy. Haven't been the same since, now that I am old.
How about the rest of you, when did you realize you were old?