This handout photo provided by Mary Washington Healthcare, taken April 16, 2013, Andrea Vassel of Mary Washington Healthcare explains the benefits of an advance directive at Mary Washington Hospital in Fredericksburg, Va., as part of National Healthcare Decisions Day on April 16. A poll from the AP-NORC Center for Public Affairs Research found people 40 and older underestimate their chances of needing long-term care as they get older, and aren't doing enough to prepare. But about 47 percent say they have taken one step, creating an advance directive to outline the medical care they'd want if they couldn't communicate. (AP Photo/Mary Washington Healthcare)WASHINGTON (AP) — We're in denial: Americans underestimate their probabilities of wanting lengthy-time period care as they become older — and are taking few steps to prepare.