Roberts and Gross (2008) report that "remarkable change" is coming to America. In terms of percentage of the population, in 2008, only 13 percent of Americans are 65 years or older. By 2030, 20 percent of Americans will be in that same demographic. In real numbers, by 2050, it is expected that 89 million Americans will be 65 or older. With respect to achieving age 100, there are currently some 80,000 centenarians in the United States and by 2025, there will be 175,000.