Talk:Haruaki Azuma/@comment-5780397-20160417124941/@comment-2406:E001:B5D1:1:B1CF:A57E:30A3:2E6-20180422064906

I'm pretty sure it was answered in the manga by the author, who said that 'the younger you are, the more your trion can increase. So the younger you are the better chance you have of getting in.'