My knees were shot at age 57, after 3 surgeries for torn meniscus, so I gave up cycling. At age 64, I got both knees replaced. At age 65, I started cycling again. After a little over 2 years, I've ridden over 9,000 miles, got my weight as low as ever -134- and have the fitness I'd expect for being 10 years older. There is hope.