linearly with age in late adulthood. Figure 1 shows this pattern for selected cohorts of women born between 1860 and 1940 for various European countries—Belgium, Denmark, France, The Netherlands, Norway, and Sweden—(panel 1) and for France alone (panel 2). Although the level of mortality has changed substantially over time, the evolution of mortality rates by age is very similar across many countries and over time (these patterns are similar though not identical for men). Mortality curves also display an “adolescent hump,” especially visible in cohorts born in the 19
mortality over the lifetime is remarkably similar across human populations and in fact across most primates. Because of this regularity, demographers have searched for a “unified” model of mortality that would predict mortality from birth to death at least since the early 19th century ( Gompertz, 1825 ). Like much of the following literature (e.g. Li and Anderson, 2013 ) Gompertz’s model accounts for mortality only after a certain age , focusing on the roughly log-linear portion of the mortality curve after age 30–40. There are a few exceptions. An early model proposed
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