In 1990, there were 37,306 Americans who were at least 100 years old. By the year 2010, there will be 131,000. And, by 2050, projections by the U.S. Census Bureau anticipate there being 834,000 centenarians.
To put that figure in perspective, those 834,000 people who will be at least 100 years old in 2050 would outnumber the current populations of cities such as Baltimore, Indianapolis, San Francisco, Boston, or Denver. In fact, they would surpass the populations of all but the top 11 U.S.cities counted in the 2000 Census.