I was surprised to find out the other day that my sister (born Jan '81) is technically considered a millennial.
She won't accept this as she, like myself, regards millennials as the hipster generation, revelling in wokeness etc. She remembers renting VHS tapes, owning a Sony cassette walkman, watching MTV, and the introduction of the world wide web.
Gotta say I was surprised and my first thought is that lots of people in their early 40s probs don't regard themselves as millennials.