Fig. 4.

(A and B) Vertical axis: variability (measured by SD of age at death) for deaths past age 65 y (diamonds) or a moving age $y$ (circles). Horizontal axis: year from 1960 to 2010. (A) Japanese females, red. (B) Japanese males, blue. Diamonds show rapid increase of $s_{65}$. For each year $t$, moving age $y=65+v\left(t-1960\right)$, with $v$ the long-term speed of the survival front. Circles show variability $s_y$.