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Debra Fulghum Bruce PhD, Healthcare, answeredThe most common type of arthritis is osteoarthritis, in which the cartiledge becomes worn and less efficient in cushioning the joints. Studies show that millions of baby boomers are in line for osteoarthritis as it is associated with increased age. After age 50, an estimated 80 percent of America's population is affected with osteoarthritis to some degree and may have signs of pain and stiffness. Some studies show that almost everyone over the age of 60 has some form of osteoarthritis even though they all don't have the symptoms.