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  2. Life expectancy - Wikipedia

    en.wikipedia.org/wiki/Life_expectancy

    In developed countries, the number of centenarians is increasing at approximately 5.5% per year, which means doubling the centenarian population every 13 years, pushing it from some 455,000 in 2009 to 4.1 million in 2050. [104] Japan is the country with the highest ratio of centenarians (347 for every 1 million inhabitants in September 2010).