and that's just for female soloists who cb and sing and promote - try finding an entire GG who's "older" and who promotes and cb and is somewhat successful
Maybe not an entire GG, but a majority of Red Velvet will be in their thirties starting next year and they're still active & successful.
I think SNSD's reunion was somewhat successful, as was Kara's. Several other 2nd gen groups have had comebacks in the past couple years but they were predictably paid dust.
Mamamoo are all nearly thirty, although they're definitely on the downslide.
If they don't disband in the coming months, Blackpink could potentially become the first third gen GG whose members are all 30+ and still "active" (at least by their standards), because that's only a few years away.
Twice could eventually make it there, but they've still got six years.
I think the remaining flagbearers of third gen will last longer on average than the previous generations, but actually making it into their thirties could be a tall order for the rest of them. There's no telling what the 4th gen groups will do, but perhaps Kpop will be less ageist by then.