In various ancient cultures Eunuchs were respected members of society, usually high ranking civil servants and it wasn’t unheard of for people to even volunteer to be castrated as adults in order to advance their position.
Lets imagine an alternate society much like todays world except the power in government is entirely held by a Eunuch Civil servant class. You are 18 and have just passed the rigorous civil service entrance exams (only 1 in a thousand pass). You now have a choice:
sign up for the Eunuch Corps and you get full tuition at one of the most prestigious universities and a guaranteed job for life. You come from a lower middle class family and cannot afford to go to university if you don’t take this offer. In this society, there is no military option to pay for university or other option, if you don’t take the Eunuch Corps, you are pretty much certain of a life of low paid menial jobs of minimum wage, or unemployment.
If you do decide to join up, you have two choices, you can sign up right now at 18 and get a substantial signing bonus, and a month off to go and blow your load before you report for the surgery. Surgery is carried out under general anesthetic and is painless. This is castration we’re talking about, removal of testicles, not a penectemy.
Otherwise you can defer and sign up at any time before age 25, but if you have any children you are disqualified for life.
The other advantage of signing up now at 18 is that you have longer to advance your career and get to a higher position before mandatory retirement at 55. All the highest ranks are filled with people that signed up at 18.
(BTW, sorry women can’t join the civil service in this society, its an unashamedly sexist society run by a heriditrary patriarchal nobility and the eunuch civil service)
So what will it be?