Not at you putting groups with 14 year olds like Wonyoung (Izone) in the same generation as Irene who is over 30 lol.
4th gen started with Stray Kids/Idle/Loona/Izone.
The 4.5 generation started with Ive. Just like how the 3.5 generation groups like BP and Twice represented the peak of Kpop's 3rd gen, we will probably see the 4.5 gen groups like Ive and New Jeans represent the peak of 4th gen.
age has nothing to do with generations, Shinee are 3rd gen age wise, NCT Dream are 4th gen age wise, Irene is 11 years older than NCT Dream's Jisung, why are they the same generation?
Wonyoung will end in 4th gen because her main group is a 4th gen group