I agree wholeheartedly. Knowledge, or even intelligence, shouldn't be the most highly valued skill in a team lead.
But there are many people extremely confident in their confirmation bias that seem to be unwilling to consider anything that might challenge their ideas. Our industry has a problem with celebrating the intelligent arsehole. Not only is humility not incentivized, it seems to be actively counterproductive.
I wonder how we can foster the kind of culture that values experience, encourages innovation, and is also able to get things done without chasing geese?
I think you're misinterpreting here. GP didn't make any generalizations about people in their 40's. They were providing additional context about a specific individual. Moreover, the context they were trying to convey was more about the delta in years of experience than a particular age bracket.
Also, thanks for the casual sarcasm, casual assumption of ill-will, casual tone policing of others according to your personal whims, casual accuse-first-rather-than-clarify and embarass-in-public-rather-than-confront-in-private approach. Really brightens the mood in here!