I've been lucky in a way, because I got into road biking in my late teens, then stopped when I went in the Army, and didn't pick it back up until I was 50. So I never overworked or got injured or any of that. I came into it fresh. I kept getting faster for 10 years or so. I started riding tandem with my wife almost exclusively at 62 and slowed down a bit. However as she's become stronger, so have I. I seldom get out on my singles, but I went out last week and did a familiar loop in the same time I used to do 10 years ago when I was 60. That was satisfying. Every year as I got older and potentially slower, I tried to train smarter, and for the most part, that let me keep up a good cruise. I've lost a lot at the top end. My hill sprint isn't much anymore, but my long distance cruise and hard climbing paces are still pretty good. Losing 10 lbs. off my fast event weight sure helped too, but that's part of training smarter. I think I could lose another 10 lbs. over the next several years.