Born in late 81. I believe in this stuff about as much as I believe in Astrology. (Not at all) Everyone's experiences are different.
I don't see that comparison at all. Sure, everyone's an individual but there are shared experiences that shape generations. Children during the Great Depression wound up being young adults during WWII. There's no way those events didn't shape their lives and influence how they raised their children in both good and bad ways. Teens living through the Vietnam/Hippy era couldn't help but absorb all kinds of messages and form many different opinions from those in the 80's. We don't even know the full extent of how Covid effected young children, due to masking, lockdowns, families staying home, etc, but it was a shared experience that cannot be removed. Gen X, growing up with no internet, had an entirely different world view than children of today.
There's a reason why marketing targets different generations and businesses hire experts to help understand the differences between their Gen X, Millenial and Gen Z employees. There are mindsets that differ wildly and getting the most from each requires different approaches.
No one is saying that all individuals within a generation are exactly the same but world events impact different ages in different ways. It's not just because you happen to be born under some Astrological sign.
"History makes generations and generations make history"