As far as I know, Boomers are the kids of the generation who came home after WW2 to repopulate the world. In other words they are “the baby boomers”.
Their kids are my generation, commonly known as GenX.
Our kids are millenials. My eldest turns 31 this year. I don’t think somebody born in 1981 can be classified as a Millennial.
There’s also this Gen Z who are the gob splat of laat lammetjies from lazy Gen X’rs and randy millennials.
To put it correctly, you determine the generation by who they were born to, not when they were born.