PLINY THE ELDER
 

NATURAL HISTORY
 

11.47

Loss of hair is rare in the woman, and not seen in eunuchs, nor in anyone before they begin to practice sex...
 
 

11.48-50 [in the context of offering facts about testicles in various species:]

In humans, they are weakened/broken [franguntur] both by injury and by the source of nature. And for that reason they acquire the third gender, on the side of hermaphrodites and eunuchs.
 
 

13.8

The date tree bears fruit from the third year in Cyprus, from the fourth in Egypt and Syria, from the fifth year elsewhere, when they attain the height of a human being; the fruits do not have stones inside as long as they are young, for which reason they are given the designation "eunuchs."