I'm a life-long Mustachian. I retired when I was 40 (59 now) and have spent much of my retirement on long hikes and bike tours. My wife and I put more miles on our bikes every year (5,000+) than we do on the car we share. A few years ago I made my first cross-USA tour and loved it, and will probably do that again soon. I commuted to work by bike, so I always stayed in shape, and am still in good shape. I see no slowing down yet, and I feel more suited mentally for long rides than I ever have been.