I like that one and I rally against it as well, but like any other discursive object, it’s helpful insomuch as it communicates ideas, however flawed.
If anything, I associate more with my micro-generation, “xennials”, but it’s fun to watch younger millennials and even older generations squirm and bristle at the thought of a mid-40s millennial.
The former because I think aging is still something alien to many of them (outside of “gah, 30, I’m sooo old, omg”). The latter because Boomers and even some Gen X perpetually associate the word “millennial” as meaning anyone 22 years or younger at any given time, immovable in time and their framework of understanding.