Who has the biggest age gap in K-Pop?

yikessssssss

Wow this is band or boy group

In terms of ggs I think After School had a considerable age difference. I can't remember how many years, but Kahi was way older than Gaeun.

project group but Refund Sisters Junghwa & Hwasa have 26 year difference.

Refund Sisters?

wasn't there a girl group where the members had a 14 year age gap

sister slam dunk group with somi and kim sook