Instead you can say "that reminds me of a similar concept we used to implement using ABC", and quietly appreciate that you got a leg up in understanding because of your experience. If young people are smart and curious, they'll want to know more about ABC, and ask.
Well, the rate of change seems to be high. Whether it's "progress" is another matter. Progress usually implies change, but the reverse is not at all necessarily true.
Who's usually in a position to recognize that and be a judge of it? People with experience.
So the question I'd ask is this: when someone with experience doesn't like change, is it because they've "crystalized"? Or is it because they have some defensible reason for disliking the change?
If it might be both, how would someone be able to tell the difference?
Say Person B is proposing a change from Solution A -> Solution B.
Person A thinks Solution A is still the correct approach.
I think it's important to understand in detail what aspects of Solution B are appealing to Person B. It may be subtle, psychological, and/or political, but there's a reason why this change is important to person B. Person A & Solution A must address those issues, or risk eventual obsolescence.
It's also entirely possible that the more correct approach is Solution C, and this process can help establish what exactly that is.
Experienced people of any age who can adapt well to change have no trouble getting a job.