Planning full-size life careers.  Consequences of the increase in the length and certainty of our life spans over the last three hundred years.
Imhof
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D003710:Demography; D049690:History, Ancient; D049692:History, Early Modern 1451-1600; D049691:History, Medieval; D049711:History, Modern 1601-; D013223:Statistics as Topic / Q000266:history*