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Human longevity: The grandmother effect (Nature)
"Why do women live long past the age of child-bearing? Contrary to common wisdom, this phenomenon is not new, and is not due to support for the elderly. Rather, grannies have a lot to offer their grandchildren."
Grandkids Could Be One Reason Humans Live Long Lives (NPR)
"For humans, life isn't nearly as short as it is for other primates, whose minds and bodies start to deteriorate around the time they reach the end of their reproductive years. Once an animal has created offspring, it has done the heavy lifting of evolution."