Generally it can be assumed that characters on here by default will be somewhere ambiguously in their teens to mid-20s. If it's clear they're prepubescent then it's child (barring cases of loli/shota, which is mutually exclusive), and then baby is self-explanatory I imagine. Mature male/female is when they hit the late 30s onward range (DILF/MILF), and then old is wrinkled skin/GILF territory (60+ish?). Old and mature (fe)male are not mutually exclusive like the other categories are though, as old mature_male and old mature_female is used to find the sexy elders (like Li Shuwen) as opposed to the unsexy old people (like Matou Zouken)
