Editing Life expectancy (section)

===Centenarians===
{{Main|Centenarian}}
In developed countries, the number of centenarians is increasing at approximately 5.5% per year, which means doubling the centenarian population every 13&nbsp;years, pushing it from some 455,000 in 2009 to 4.1&nbsp;million in 2050.<ref>United Nations [https://healthprep.com/aging/#WPA2009-report.pdf "World Population Ageing 2009"]; ST/ESA/SER.A/295, Population Division, Department of Economic and Social Affairs, United Nations, New York, October 2010, liv + 73 pp.</ref> Japan is the country with the highest ratio of centenarians (347 for every 1&nbsp;million inhabitants in September 2010). [[Shimane Prefecture]] had an estimated 743 centenarians per million inhabitants.<ref>{{cite web|work=The Japan Times|url=http://search.japantimes.co.jp/cgi-bin/nn20100915a8.html|title=Centenarians to Hit Record 44,000|date=15 September 2010}} [[Okinawa Prefecture|Okinawa]] 667 centenarians per 1 million inhabitants in September 2010, had been for a long time the Japanese prefecture with the largest ratio of centenarians, partly because it also had the largest loss of young and middle-aged population during the [[Pacific War]].</ref>

In the United States, the number of centenarians grew from 32,194 in 1980 to 71,944 in November 2010 (232 centenarians per million inhabitants).<ref>{{cite web|url=https://www.census.gov/popest/national/asrh/2009-nat-res.html|title=Resident Population. National Population Estimates for the 2000s. Monthly Postcensal Resident Population, by single year of age, sex, race, and Hispanic Origin|archive-url=https://web.archive.org/web/20131010072957/http://www.census.gov/popest/national/asrh/2009-nat-res.html|archive-date=10 October 2013|work=Bureau of the Census}} Different figures, based on earlier assumptions (104,754 centenarians on Nov.1, 2009) are provided in {{cite web|url=https://www.census.gov/newsroom/releases/pdf/cb10-ff06.pdf|title=Older Americans Month|date=May 2010|archive-url=https://web.archive.org/web/20160216221613/http://www.census.gov/newsroom/releases/pdf/cb10-ff06.pdf|archive-date=16 February 2016|publisher=Bureau of the Census|work=Facts for Features|page=5}}</ref>