Castration can increase a man's lifespan by up to almost 20 years, a study of eunuchs has shown.
Scientists analysed genealogy records of members of the Korean imperial court dating from 1392 to 1910.
The records were kept as proof that people belonged to the noble class.
They included information about eunuchs, who either lost their reproductive organs in accidents or underwent castration to gain early access to the palace.
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