FIGURE 2. Conventional and rescaled old-age dependency ratios.

From the following article:

Average remaining lifetimes can increase as human populations age

Warren C. Sanderson and Sergei Scherbov

Nature 435, 811-813(9 June 2005)

doi:10.1038/nature03593

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a, Germany; b, Japan; c, United States. The old-age dependency ratio is the ratio of the number of people at the retirement age and above divided by the number of people in the working ages. Rescaling increases ages at the beginning and end of working interval proportionally to changes in life expectancy at birth. d, Proportionally adjusted retirement ages in Japan. The values for 2000 are observed; later values are medians based on 1,000 simulations (for 95% prediction intervals see Supplementary Table 2). All figures are based on period life tables.

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