>" ... My impression is that usually, in my experience, they're very jaded and set in their ways. They seem to like to do things their own way and give the impression that they're infallible because they deconstructed an x stack in y decade ..."

Remove the word "decade" and that could describe people from just about any demographic in tech - millennials, Gen X, etc.

>"and complain about the cyclical nature of programming"

How is complaining about that particular thing different or worse than complaining about why language X sucks because it doesn't have generics or feaure ____" or any of the other complaints about various languages or frameworks that come up on HN all the time?

>"They also seem to usually not go out to happy hours/events with the team to get to know one another as often, so they're excluded a little more, which leads to fewer people getting to know them."

The only way to get to know people is to go drinking after work? You know you can go out for coffee and lunch with people too right? Or is that somehow less meaningful because it doesn't involve booze or craft beers?

Honestly your comments come off as ageist.