[thesagan]

I'm not sure this is an age thing, but a personality thing. I've worked with several people in their 20s and 30s who have had one or more of these traits, as well as older folks who had few or none.

I'm stopping short of making any generalizations, because in my experience the evidence (for me at least) isn't there to make any. Perhaps things are different elsewhere, though. I'm only speaking from my experience, as I suppose we all are.