At work, my team is composed mostly of individuals born in the 80's and we are only a handful of 90's. We share the same workplace attitudes.
The person I am dating was born in 1985. We see the world in a very similar way and share a lot of the same hobbies.
I did not come up with the date range. Look anywhere and that's what you will see.
"Researchers and popular media use the early 1980s as starting birth years"
https://en.wikipedia.org/wiki/Millennials