Fig. 2
Combining cohort survivorship with proportions of individuals being in the healthy state. The vertical lines on the left side give the share of unhealthy individuals in each cohort in 2015 on the basis of data for French males, i.e. the π(x, t) function. The right side shows the corresponding proportions of cohort survivors pc(x, t − x). Combining these two quantities gives the proportion of being both, healthy and alive in 2015, defined as pc(x, t − x) · (1 − π(x, t)). Accordingly, only the dark grey shaded vertical lines refer to cohort survivors being in good health. The remaining light-shaded lines give the unhealthy share of cohort survivors