"These findings, while eye-opening, match what we see in the everyday world. American women who reach menopause after the age of 50 have an increased chance of reaching their 90th birthday and tend to outlive men on average by five years. Castrated men throughout history have been known to also enjoy longer lifespans, which was backed up by a 2012 study that found eunuchs in the employ of the Korean royal family between the 16th and 19the centuries outlived uncut men by a staggering 14 to 19 years."
""In females, lifespan increases after several different forms of sterilization, suggesting that benefits arise from reducing the substantial energetic and physiological costs of pregnancy, lactation and caring for offspring, rather than from a single hormonal mechanism," said lead author Mike Garratt, biomedical science professor at the University of Otago in New Zealand - in a statement about the research."
An analysis of more than 100 mammal species, including humans, indicates that curtailing reproduction correlates with increased lifespan in both sexes. Female lifespan increases after various forms of sterilization, likely because preventing pregnancy, lactation, and offspring care reduces substantial energetic and physiological costs. Males sterilized before puberty, particularly via castration, appear to live longer because sex hormones influence biological aging; vasectomies do not have the same effect. Historical and demographic evidence supports these patterns, including longer-lived eunuchs in historical Korean records and later menopause correlating with higher chances of reaching advanced ages.
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