Hi there!
The condition being referred to is an age/ wear and tear disorder known as Osteoarthritis. Osteoarthritis is a mostly age related disorder that results from wear and tear during use. While it is a natural part of life remaining active and taking other steps can reduce the rate and relieve symptoms of Osteoartritis.
Also take mind that I don’t say arthritis as that is a general all encompassing term. There are two other principal arthritis types: Rheumatoid, which occurs as an autoimmune disorder wear the body attacks the joint, and Gout, which results from a buildup of Uric acid in the joints.