(IN 2010 Music Core did not award #1's.)
(Solo efforts or permutations like Got it beat are not included since it is hard to ascertain who did what.)
2010
T-Ara 13
After School 1
SNSD 15
Kara 6
MissA 2
2NE1 7
Sistar 1
7 groups won #1 in 2010. There were no 'older' group.
2022
Groups debuting in 2000s
Kara 2
Groups debuting in 2010s
Fromis Nine 2
Itzy 2
Gidle 10
Groups debuting in 2020s
IVE 23
StayC 2
Kep1er 2
(CSR is not counted since its 'win' is not a true win.)
5 Acts debuting after 2020 won #1s in 2022, while 1 act debuting in 2000s and 4 acts debuting in 2010s won #1s as well.
So, surprisingly, the older generation is holding on pretty well.