World's Population of 100-Year-Old Could Be 6 Million

POSTED: Sunday, July 19, 2009 - 9:12am
UPDATED: Friday, April 13, 2012 - 9:52am

The number of centenarians already has jumped from an estimated few thousand in 1950 to more than 340,000 worldwide today, with the highest concentrations in the U.S. and Japan, according to the latest Census Bureau figures.

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