the idea that older people have no wisdom to offer
Ah, I see. Could be. The focus shifting from older/wiser to younger/cooler? I wonder why that would be?
Who invented 'cool'? Post-war? Does it suit those in power to keep the masses refusing 'experts' and dumbed down? (Not saying young people are dumb, you understand, but that they have by definition far less life experience).
The cult of youth (please don't delete me, MN, it's sometimes just a relatively inoffensive word describing a social phenomena) is definitely something that's changed over time. In fact, the whole 'creation of childhood'.
I don't know. Thinking aloud.