The decline in the number viable ovarian follicles, which leads to the menopause, is well documented (see Wikipedia), but, from an evolutionary perspective the reasons for its prevalence in humans are unknown.
Only two other mammals are known to exhibit menopause - orcas and short-finned pilot whales.
“Menopause is an evolutionary puzzle since an early end to reproduction seems contrary to maximising Darwinian fitness.” source
More details BBC, Aug 2016
“From an evolutionary perspective, it's very difficult to explain”
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