I'll be 72 in a few weeks and have definitely felt my age over the last few years. I continue to cycle, hike, and ski, but I have more aches and pains and I experience reduced stamina. This is what aging is all about. My usual rides nowadays are around 20miles, and my hiking is down to between 10 and fifteen miles on a given hike. I ski, both downhill and cross-country, regularly, but I have shortened my days for these activities. I plan on continuing all my outdoor activities until I can't do them anymore or until they are no longer enjoyable. so far so good. I don't look ahead.