Let's see...at 25 I broke an hour in a 40k (triathlon), under 430 in a century, was 40 pounds lighter, could wear a speedo... (Bob Segers like a rock should be playing in the background).
That would be 1988 for me. Had a steel pinarello and I felt like I was made of steel too.
I don't feel old yet, just heavy, once I lose 40 pounds I'll be back in the game.