Earlier quoted context omitted.
That's just because people died young. The mode (most common) age of death was over 75 in France for men in 1930. I'm not sure how WWII factors into that. It's now about 82, eyeballing it (yes, still higher). https://www.cairn-int.info/article-E_POPU_1204_0683--the-mos... People were not "old" and dying at appreciably higher rates given they reached age 60 back then. The general premise that there's a lot of rich old…
Why does the mode matter? We are discussing cost , which is related to the the number of retirees. The average lifespan tells you how many people you can expect to be retired at a given moment, the mode tells you... what exactly?
1. A high infant mortality rate brings average lifespan down.
2. Infants don't contribute to the economy nor to public pension funds.
A country might have low life expectancy, but a relatively close number of workers and retirees, as life expectances can be (even more so in developing countries) multimodal.