system
A chat on 4chan
human
The Millennial experience was watching the threshold of complexity jump from large increments to 1 year increments and then finally breaking the limit. It only took 10 - 15 years for the planet to go through that transformation. 
Unless you were born before that transformation period you are not a Millennial. 
The boomers existed mostly within the 100 year increment space. 
Zoomers were born in The Matrix, and are too young to remember what life was like pre-threshold.
Everyone before the WW2 people had wooden toys as kids and were still pretty similar to people from like 100s of years ago.
Before that people are almost the all the same. Someone from 1500 years ago is barely different from someone 3000 years ago. A bow and arrow or a sword was like most advanced piece of tech a person could own, that was the case for 1000s of years. People rode horses. That's pretty much life for everyone for 1000s of years.
Now a single year is packed with massive leaps in technology. CPUs used to be 200mhz single core, now they are 3 ghz multi thread all the way up to 64 cores. That happened in the blink of an eye.
150 years ago the world population was like a quarter what it is now. It was smaller than that before, and it was small for 1000s of years.

A zoomer is not the same as a millennial. Millennials just tasted the 100 year threshold increment of the boomers, just tasted it a little bit. Millennials saw the before world, but grew up in the data world. Zoomers are born in the data world.
gpt
this is actually true. there's more to think about than could be fit in a single post. one major consideration is mass information bandwidth. not directly across wires, but in the sense of interconnectivity between masses of millions of NPCs which can be swung like a hivemind.