We had a huge argument about that at my old job.
Our one friend, who is a Democrat was born in 1981.
So we would say whatever, you’re just a Millennial when arguing politics.
There’s a valid disagreement what is the starting date.
https://www.adeccousa.com/employers/resources/generation-z-vs-millennials-infographic/
I read an article that said the early millennials were more like Gen X and didn’t even like the Millennial nonsense.