This will be a pretty US-centric topic from my end, but if you want to comment on your own country, please do.
I think the first thing is to acknowledge that the titles are used for grouping people are, if not stereotypes, at least broad generalities and of course don’t apply to everyone. The second in that there are lots of stereotypes (about Boomers, at least) that were actually only ever the minority that got attention.
The third thing is to determine how or in what context such terms might be useful? Broader sociological trends? Music tastes? Fashion at a given age? Spending habits (ie, useful to advertisers)? I’m really talking about something broader than advertising.
I’ve seen it argued that Baby Boomers were the only ones that really merited a generational name. That they represented/lived through/caused a huge break sociologically with norms very different from their parents’ generations. Whether or not that’s true may depend on what you are measuring and where your start point is. Nonetheless the “generation gap” as viewed through the lens of pop history (which I cannot comment on the accuracy of) certainly seems larger than today’s, but is that because it really was or because we have much more nuance when looking at the present? Or simply because there were so many more of them that they either could move the needle of norms more or control the narrative more?
Example on nuance - casual clothing like jeans for daily wear didn’t start with the boomers. But I don’t know to what degree the teens of 1948 kept wearing them as adults. Rock and roll started with those pre-boomer demographic, but it was different than the rock of the sixties, and then there’s when it went from “youth music” to just “music.” The anti-Vietnam-war movement is associated with boomers, but of course, many leaders were much older. Civil rights for African Americans again is something where huge strides were made by the pre-boomers (though it’s worth pointing out the different methods and goals used in different time frames, I’m not sure how age-dependent those were - I lack nuanced knowledge there). Sexual mores, feminism, etc. - I just don’t how much of the older population changed alongside younger people (as in recent time with same sex marriage we see that older people changed opinions rather than just dying off while younger ones with different opinions replaced them).
Also some further divide that because the experiences of an early boomer and late boomer were very different - does that mean “boomer” gets narrowed or that “boomer” isn’t that useful as a catchall. Some say being old enough to be drafted to Vietnam is a cutoff point. Others would tie it to non-political aspects like music or age when birth control pills or AIDS arrived on the scene.
Later divides we see as generation-defining might be fall of the USSR, the end of hair metal, growing up with internet, coming of age after smart phones or social media, remembering the rise of hip hop and/or rap, graduating during the great recession, whether or not one was born for 9/11 (or old enough to remember it). Maybe in the future remembering the pandemic will be an issue or the as yet unknown consequences of current military actions or work from home movements or demographic shifts.