Pudgy dads and grannies who care

In the past, the average lifespan was only about 30 to 40 years and most people did not survive beyond their reproductive years.

A percentage of both men and women did live to old age. How was this useful from an evolutionary point of view?

Please or to continue reading the full article. Learn more about ST PREMIUM.

Enjoy unlimited access to ST’s best work

  • Exclusive stories and features on multiple devices
  • In-depth analyses and opinion pieces
  • ePaper and award-winning multimedia content