I think the reason the age is mostly 19-25 is because that is the age where physical development peaks. If you're younger there is hope for development.
On the other hand, I think the reason people above 36 wouldn’t be here is because they either killed themselves or were successful enough with their careers to where they could just pay for sex, whether through prostitution or a relationship (which is just prostitution with extra steps anyway). The older guys seem to be more red pill than black pill.