When I was 50, I had never run more than 5 miles at once in my life. By 52 I had run my first marathon, in addition to a number of other long distances. Within the past year, when I turned 60, I set lifetime personal bests for 10K, 10 miles, and half-marathon (13.1 mile) distances. It's really cool now to consider that I can go out and run a half-marathon without any special training -- just "do it". So yeah, it's never to late to get back in shape (or in shape for the first time!), and you'd be surprised what you're capable of in your old age. I also got my first road bike last June, and in October "rode my age" in a local event.
