I'm 53, guess I'm the ole fart here

I've had two injuries in 25+ years of exercising... The first one was trying to run too far too quickly and got sore knees, and that resolved itself by slowing down, not increasing my mileage so quickly and Glucosamine... I no longer take Glucosamine and my knees are fine... The second was my shoulder which was an injury than came sloooowly over time and I ended up having to see a physical therapist, it still bothers me if I'm not careful when lifting, but it's ok for the most part...
Oh, and another injury happened about 10 years ago while rollerblading. I fell and pulled a muscle in my calf and ankle, I never got it checked, but maybe I should have it was black and blue... I used ice and heat for a few days kept it elevated and did no workouts for about 4 weeks... Today it's fine...