The way "generations" are talked about and referred to in KPOP is a notion I don't believe we use these in the same way in Western Music Industry. I've speculated that it is tied to contracts, but it's not like all groups only sign in one set year and then at year 7 another group comes in to take over. There are disputes among who is what generation all the time.
How do you feel about generations?
How important are they to you?
How would you define them?