I'm 57, overweight because of a health problem we just figured out, and I ride at least 3-4 days a week. Only reason I don't ride on a particular day is because legs are dead or I have chores. I have a friend who's almost 95. He's pissed because he used to go out for 60 mile rides and the Doc told him to take it easy (I think he had hip replacement surgery) but he still does 100 miles a week.
If something starts to hurt, then get it checked. My orthopedist told me I need to add walking into my exercise program to keep some pressure on my back so it won't get worse (broke it in 1982), so as long as you are pain free and you do some cross training, you should be good to go. Learn to listen to your body. Differentiate between soreness from pushing yourself and pain from something being wrong. Pain means "STOP" and go get it checked out before it gets too bad.