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See, I worry that with 1 you are conflating two "startup demographics" - people who interact on HN are probably interested in startups, but many (most?) of them aren't working for startups.

i definitely fit in that category

Likewise. I'm working at a small company, and the tech's interesting, but it's really not a "start-up" in the sense used here for a host of reasons.

Kind of by definition though - I think there are more hackers at 30+25 = 55 rather than 30-25 = 5.

The highest bin does not necessarily a majority make. Right now that bin is less than a third.

Just clarifying the facts. Not disputing your conclusion.