every idol you just mentioned debuted at an older age than an entire THIRD of this group... please be serious
people who are saying A20 are too young to debut, here's the age of 5th-gen idols when they debuted:
Ye-on (Hearts2Hearts) - 14
Chiquita (BABYMONSTER) - 14
Seah (TUIDE) - 15
Yi Hani (TUIDE) - 15
Saki (TUIDE) - 15
let's treat all idols equally