SARASOTA, Fla. (AP) — An increase in the number of younger residents of nursing homes is posing a challenge for caregivers and patients alike.An analysis of federal data shows about one in seven nursing home residents in the U.S. is now under the age of 65, more than 200,000 all told. That's up about 22 percent over the past eight years.Experts attribute the increase to medical advances that have kept alive people who've suffered traumatic injuries as well as the shuttering of mental health facilities.Caregivers say nursing home residents — young and old alike — share many of the same physical demands. But facilities are trying to accommodate younger patients' very different psychological and social issues.