Thats weird, most people my age like Stray Kids
The demographics on who buys more of their albums, searches them up on Naver more, attends concerts.. show their biggest age group is easily 20s. But of course they many fans in other age groups too.
It's nice to hear that you know so many who like SKZ. Their fanbase seem quite balanced. For me it was still just a positive surprise if all the girls in OP's 11 year old relative's class was a fan.