Weird. Considering us folk born in the early 80s got lumped with millennial. I was playing all the doom and doom clones in the library in middleschool.
Yup, I'm a later 80s millennial, but I'm the youngest of four and my oldest sibling is at the top end of gen x, so I played lots of 80s and 90s games because that's what we had available (first consoles were an Atari and NES).
I played Doom as a kid and I played gzdoom as late as college with friends, it's great fun! In fact, if someone mentions "Doom" in a conversation, I think of OG Doom, not 2016 Doom.