Talk:Hashira/@comment-27973430-20190721124747/@comment-40238811-20190805134213

"People of their strength are supposed to be rare and hard to be replaced". Where did you read that? It is not true at all and I don't remember it was mentioned anywhere in the manga. Pillars are not rare. To become a Pillar, you just need to kill a Demon Moon or 50 demons. It is pretty easy to become a Pillar. Even strongest Pillar is no match to the Upper Moons so most Pillars die young. The Upper Moons mentioned that they ate plenty of Pillars. We also got former Pillars there. You could think that after they reached 25, they become tired of the dangerous life so they retired and started a family, trained the younger generation like Uzui. He retired when he is just 23.

Our main trio reach Pillar level since they killed Upper Moons.

20 is the peak of physical strength of a human anyway. Athletes started their training from a young age, reach their peak in early 20s and after they reach 25, they started to lose from younger generations in physical aspect but are better in experience.