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ResearchBlogging.orgHUMANS CAN live to over seventy years old, yet female fertility begins a precipitous decline after about forty years of age. This is unusual since most other species continue reproducing into old age. Some have proposed our extension of life past reproductive years is due to a survival benefit for grandchildren with grandmothers who contribute to their care. However, this benefit is not enough to explain the initial cessation of reproduction.

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