I'm 66 and just finished a 12-mile bikeride, half of it up about a 5% grade. I'm doing about 50 miles a week these days. I also hit the gym 3-4 days a week to work the weights. I've lost 15 pounds in the last six months. I had the bow-legged thing going on. It's because the cartilage on the inside of the knees wears out, forcing the knees outward. Being overweight accelarates this unsettling horror. So 18 months ago I had both knees replaced, and the docs straightened my legs again.
Sex. I think about it all the time - not much different than I did 40 years ago. Sometimes I remind myself of myself in my late teens, when I thought about sex only about 3,000 times a day. To my kids, my interest in the opposite sex is gross. And boy, I do appreciate a well kept woman. It seems virtually all the women I date, usually only once, have given up. They've cut their hair short & donned baggy clothes, complete with large bellies. Sorry, no sexual attraction there. If you go to dating sites, you'll see an awful lot of women in their 50s and 60s with more photos of their dogs and cats than themselves. And women wonder why men my age look at younger women! It gets really discouraging.