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** ADVANCE FOR USE AT 12:01 A.M EST MONDAY, MAY 23, 2011 AND THEREAFTER ** In this Friday, May 13, 2011 picture, Karen Cornwall plays with her dogs Bel, left, and Mac, in front of her home in Havertown Pa. Cornwall, a nurse who played a slew of sports since childhood, had both knees replaced last year when she was 54. Dr. Nicholas DiNubile, an adviser to several pro athletic groups and a spokesman for the American Academy of Orthopaedic Surgeons, says "The boomers are the first generation trying to stay active in droves on an aging frame" and are less willing to use a cane or put up with pain or stiffness as their grandparents did. (AP Photo/Matt Rourke)

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