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Elderly ratio: number of persons aged 65 years and older divided by number of persons aged 20 to 64, times 100. (Data from He W, Sungupta M, Velkoff VA, DeBarros KA. U.S. Census Bureau, Current Population Reports, P23-209, 65+ in the United States, Washington, DC: US Government Printing Office; Figure 5. Source: Demography and Epidemiology, Hazzard's Geriatric Medicine and Gerontology, 7e Citation: Halter JB, Ouslander JG, Studenski S, High KP, Asthana S, Supiano MA, Ritchie C. Hazzard's Geriatric Medicine and Gerontology, 7e; 2017 Available at: Accessed: October 31, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved
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