how old are millennials
What Itâs Like To Be An âOldâ Millennial. I didnât know I was a Millennial before coming to work at Elite Daily. Like a lot of people, I thought of Millennials as primarily 20-somethings, which the majority of my Millennial co-workers and employees are. But the most common definition actually puts Millennials, or Generation Y, between 18 and 33. At 32, I just barely fit into the Millennial demo, although Iâve seen the demo defined widely enough to include people born in 1979.