I am a counter-example to your musings. I'm 50 and have virtually no interest in non-tech on HN. That's not why I'm here. I'm interested in programming, science, math, and technology, and interested in topics such as psychology only insofar as they impact on usability.

I do have very broad interests outside of technical topics, but regard as pointless and irrelevant here postings on consciousness, etc.

Including this one.

I've noticed in the past that whenever you try posting on topics outside of technical matters you are repeatedly ignored or flagged. Perhaps an alternative hypothesis is that while these things are of interest in general, they don't really belong here. The evidence seems to be against your hypothesis. Try applying some science and changing it.