By 2030, approximately 70 million people (or about 20 percent of the U.S. population) will have passed their 65th birthday and will be at risk of developing osteoarthritis. Growing older is the most significant risk factor for osteoarthritis, a common joint disease in which cartilage has worn away, allowing bones to rub together. Some common symptoms of osteoarthritis include joint pain and limited movement. Some of the things that you can do to help prevent osteoarthritis include maintaining a healthy weight; eating a well-balanced, healthy diet; exercising regularly; and preventing joint injuries.