Every generation at some point or another starts voicing disrespect for their elders, whether because they perceive that the world which the older generation has handed them is deficient, we older folks have ruined the economy, etc., or just on general principles. It's just human nature to do so.
We certainly did so with our own parents, to be sure, 40-50 years ago, when some of us decided we couldn't trust anyone over 30, or maybe we started growing our hair long simply because our parents had told us not to do it.
Well, it seems the current kids are now doing their own thing like this, from what I have read lately. Unless it's really just a passing Internet fad and has been overblown.
But it does seem, from what I have read, that some young people nowadays are using the phrase "OK, boomer" in all sorts of conversations with us older folk and in all sorts of contexts, to express an only mildly disguised impatience, perhaps even slight contempt, for what they see as the flawed comments or doings of us "boomers."
The phrase even seems to have international standing (well of course it would, in this age of the Internet), as when this young New Zealand lawmaker used it to put down an older heckler:https://www.youtube.com/watch?v=uylveslafs8
One youthful rock group has even come up with a song celebrating the phrase: https://www.youtube.com/watch?v=ceu9stzmlr4
Personally I haven't heard this phrase used yet (have you?), or maybe I just don't get out enough.
But here's a pretty good defense of us ol' boomers, presented with a touch of humor that this topic, frankly, deserves:https://www.oregonlive.com/opinion/2019/11/the-kids-may-ok-this-boomer-to-their-hearts-content-opinion.html
But if one were to experience this comment leveled at oneself by a young person, perhaps a suitable retort might be "Well just wait 'til you young guys have to deal with prostate cancer some day, like us old boomers!" But IMHO that would be where the humor ends, going a bit too far. I would not say that to anyone, regardless of what they had said to me.
But what I really WOULD like to say to them in such a situation, were it ever to come up, is: "Maybe during the next 30-40 years, after which you guys will be where we boomers are today age-wise, perhaps by then research being done now by some boomer-age researchers will lead to a cure for PCa, indeed for all cancer, and then you young dudes will certainly need to acknowledge that boomer-age researchers at least got that
"Okay, boomers," I guess I've made my point, right? <grin>
Chronic prostatitis (age 60 on)
BPH w/ urinary obstruction, 6/2011
Ongoing high PSA, 7/2011-12/2011
Biopsy, 12/2011: positive 3/12 (90%, 70%, 5%)
Gleason 6(3+3), T1c
No mets, PCa likely still organ contained
IMRT w/ HT (Lupron), 4/2012-6/2012
PSAs (since post-IMRT): 0.1 to 0.3 range