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In 1900, the world population was less than 1.7 billion people; the United Nations projects that in 2000 it will be 6.2, and in 2020, 7.9 billion. The proportion of the elderly (65 years and over), will increase from 5.1% (1950) to 6.8% by the year 2000 and to 8.8% by 2020, when out of an elderly population of 796 million people, 124 million are projected to be 80 years and over. Due to an increasing...
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