No. But we are all a combination of our biology plus our experiences. Bring born at the same time as someone means a significant portio of your experiences will be more similar than with someone born decades after you. The fact is that Zoomers went through a disruptive global pandemic either while still in education or leaving to start their careers. That experience will inform who each of those young people become. The way that this effects each individual Zoomer will vary but it will affect them and so it makes them a demographic of "people who's education or early work experiences were disrupted by a pandemic." Those people will on average be a little more similar to one another then people who didn't experience that. Generational identities are formed by all the millions of experiences, big and small, those people have in common with one another but not with other generations by merit of being born at a particular time. Just as Zoomers went through a pandemic at a crucial early point of their lives the Greatest Generation endured the great depression and world war 2 in the first half of their lives. There's absolutely no reasonable way to claim that living through world war 2 wouldn't inform your personality and behaviour on some level. And so, people from the Greatest Generation (who lived through World War 2) will, due to that experience and many others, will have things in common with one another that they do not share in common with Zoomers (who didn't live through World War 2.) Another huge example is that somewhere roughly alligned with the millennial generation we made the transition from people who grew up with constant easy access to the vast expanse of information and communication on the Internet and people who grew up before they'd ever heard of it. Those are hugely different experiences. They change the part of you that is due to your experiences. The other people who share those experiences will tend to have commonalities with you that people who didn't share those experiences don't have.