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What is the life span of a question on SO? Or more to the point... do valid, relevant, answered, questions get deleted in a "house cleaning" effort periodically?

I didn't see any obvious answers to this looking around...

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10k+ users can see deleted posts, so hard deletions are rare, if they ever happen at all. – Martijn Pieters Sep 21 '12 at 19:51
Perhaps the blog post The Stackoverflow Question Lifecycle is worth a read – Some Helpful Commenter Sep 21 '12 at 20:13
up vote 7 down vote accepted

This valid, relevant, answered question was one of the first ever on Stack Overflow, and it's still open and active.

There's occasional house cleaning of crap, but good, quality content is allowed to stay forever.

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It should be noted that the definition of "crap" is subject to change as time goes by. A question considered great a few years ago may now be considered off-topic, or not-constructive. – Rachel Sep 21 '12 at 20:02
@Rachel - Yeah, I was wondering what the definition of "crap" was – Mike Sep 21 '12 at 21:51

Valid, relevant, answered, questions do not get randomly deleted. Old, unanswered questions or those against the FAQ are subject to it, however.

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and even then, hard deletion only happens after quite some time in non-exceptional cases – Servy Sep 21 '12 at 19:49
Old, unanswered questions only get deleted if they have a score of zero or lower or a score of 1 with a deleted owner. Here's the specifics in detail – Some Helpful Commenter Sep 21 '12 at 20:11

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