Secondly, I know your comment was tongue-in-cheek, but that would actually be a very appropriate age cut-off for what strikes me as a remarkably elitist endeavor.
I'm at 730 days and I can support 1337 days, so long as I can read. I don't mind waiting just shy of two to be able to comment so long as the comment and post quality is exceptional.
TBH I'm fascinated to know how the community would differ from HN of 4 years ago, since all the older participants would be 4 years more experienced in life and hacking.