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He postulates that if women survive beyond an age at which they can reproduce and men continue spermatogenesis, then old males can benefit greatly if they can copulate with younger females. It is theorised that increased use of tools and weapons compensates for the decline in natural fighting ability with age. [ 3 ]
The male-biased philopatry theory proposes that if human social groups were originally based around women leaving their birth communities at sexual maturity more frequently than men, then reproductive females would become more closely related to other group members as they grew older, making the inclusive fitness benefits older females receive ...
How you experience PMS during your reproductive years may indicate how early you begin menopause, a new study says. And that can put you at risk for serious health conditions.
Male menopause, or andropause, isn’t just a myth. About 2 in 10 men over the age of 60 suffer from low testosterone levels, according to the American Urological Association. This number ...
A study of a population of French women from 1670 and 1789 shows that those who married at age 20–24 had 7.0 children on average and 3.7% remained childless. Women who married at age 25–29 years had a mean of 5.7 children and 5.0% remained childless. Women who married at 30–34 years had a mean of 4.0 children and 8.2% remained childless. [20]
Data source: Statistics Canada. [2] 3-year average: Life expectancy in Canada in 2020-2022 [1] [3] Life expectancy in Canada in 2017-2019 [1] [3] Life expectancy in Canada in 2018-2020, 3-year average. [a] The legend is identical to the one given in the health region map below. [1] [3] Life expectancy in Canada in 2015-2017, 3-year average, by ...
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