Number of centenarians in the U.S. in 1950 :

2,300

Source: USA Today, 12/27/1999

 
   
  Estimated number of centenarians in the U.S. as of Aug. 2004:

64,658
According to the Census Bureau.
Source: Philadelphia Inquirer, 5/22/2005

 
   
  Odds that an American will live to 100 :

2 in 10,000

Source: New York Times, 10/30/2005

 
   
  Birth order position with the highest chance of reaching 100:

First born in large families
According to a Chicago study, first born Americans in large families were several times more likely to reach 100 than later born children.
Source: New York Times, 10/30/2005