The number of senior citizens has already jumped 23 percent since 2000 to 516 million, according to census estimates released on Tuesday. That's more than double the growth rate for the general population.
The world's population has been graying for many years due to declining births and medical advances that have extended life spans. As the fastest-growing age group, seniors now comprise just under 8 percent of the world's 6.8 billion people. But demographers warn the biggest shift is yet to come. They cite a coming wave of retirements from baby boomers and China's Red Guard generation that will shrink pensions and add to rising health care costs. continue reading at http://www.msnbc.msn.com/id/31507341/ns/health-aging/
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