HUMAN LONGEVITY 



61 



lived as compared with short-lived children is very considerable. 

 Thus the mean-after-lifetime of fathers of children dying (or 

 living) at ages of 80 and over is about IS per cent greater at age 



Sons o/^/a//?ers 

 c/t/Zn^ (//7c/erS0\ 

 JO '7^ inc/usfVe 

 o/7(/(S0 a/7c/a^er\ 

 years ofo^e. 



Afe(7n'afier-//^//r??e ai age 



Fig. 8. Expectation of life in years (mean-after-lifetime) at ages (birth), 20, 



40, 60, and 80 years, of the sons of fathers dying- (a) under 50 years of age 



(solid bars) 3 (b) between 50 and 79 years of age (double cross-hatched bars) j 



and (c) 80 and over years of age (single cross-hatched bars) 



sixty than the mean-after-lifetime at the same age of fathers 

 of children dying under five. 



What now of the situation turned the other way about? How 

 will the respective life tables compare if we construct them for 



