AOS EAD Extensions for kids age above 21

I would like to know what’ll happen for the kids who have got their AOS EAD-C(09) and soon they turning out 21 in the next few months/a year from now.At the same time their parent’s I-485 PD is waiting to become current based on the final action date, of course not on the filing date?

Will Kids get their second extension of AOS EAD i.e., after turning 21?
I know for sure, kids’ will fall off from H4 dependant, once they turn 21 and
also, who are not eligible for CSPA.

Once the kid loses the H4 and the CSPA age is not locked, they cannot get EAD as they have aged out.

They should change status to some other type of visa to stay in the US legally.