>>62608216The idea behind hiring hags during the black project era of Hololive was to intentionally make men take those older women as their wives and give them babies too despite their age. Why? Well, because the Japanese live for a long time, assuming they don't die tragically. This means that even when the men would breed hags, they would still have healthy babies and they still get to be around to nurture their growth even later in their life. This means that both the pool of young and older women would get impregnated, meaning that the population problem they face would eventually fix itself at an incredibly fast rate since both of those demographics would get pregnant basically at the same time. There would have been an era where some were born from young moms, others born from older moms. But of course, once Abe died the entire thing was called off.