The cutoff is "about a year". That window varies a bit depending on the article. In this case, because the story had such a lot of attention on HN in 2017, I stretched the window; but it was a borderline call.
In general it's just fine to post older things that are interesting.
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Re-posting old things that are interesting is not OK? It was tagged as being from Jan 2017
This is in the FAQ: https://news.ycombinator.com/newsfaq.html.
The cutoff is "about a year". That window varies a bit depending on the article. In this case, because the story had such a lot of attention on HN in 2017, I stretched the window; but it was a borderline call.
In general it's just fine to post older things that are interesting.