Millennials are defined as anyone born between 1981 and 1996, which is a pretty large span of time.
Some people who are considered a millennial just don't feel like they belong. They're older than the rest of the millennials and can't relate to the younger ones. WELL... now you have a new term to describe the type of millennial you are.
If you were born between 1981 and 1985 then you are now considered a "geriatric millennial." Ouch. That's taking the "I'm so old" comments to new heights.