Understood, the comment I was referring to was this one a bit further up: https://news.ycombinator.com/item?id=42188151

I responded to your comment because it was the most recent in the thread, but I agree that it would have perhaps made more sense as a reply to the other commenter.

Anyhow the broader point I think is worth making is that there is often a more context-specific approach, of which eligibility criteria for competitive sporting events is one example.