In January 2011, the first baby boomers turned age 65. Over the next twenty years, the number of adults who are ages 65 and older will double. The population of those ages 85 and older—the group most likely to need acute, primary, and long-term care—is expected to increase five-fold. One in five Americans will be of age 65 or older, compared with 12 percent today (Institute of Medicine, 2008).