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United Nations estimates of aging by region, 2011 and 2050 (projected) Statistics obtained from the United Nations, Department of Economic and Social Affairs, Population Division. World Population Prospects: The 2010 Revision, Highlights and Advance Tables (2011) (Working Paper No. ESA/P/WP.220). Retrieved February 20, 2012, from United Nations http://esa.un.org/unpd/wpp/
