In 1980, there were 720,000 people aged 90 and older in the United States. In 2010, there were 1.9 million people aged 90 and older; by 2050, the ranks of people 90 and older may reach 9 million, according to a report from the U.S. Census Bureau, commissioned by the National Institute on Aging (NIA) at the National Institutes of Health.