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I am hesitant to remove them outright because they may have links in the past and removing them would cause 404 and potential loss of past link juice.
For example, some posts deal with old technologies that has discontinued and no one ever searches for them at the current time.
How can a web page be "stale" if it provides the best information on it's topic?
IMHO, informational websites probably needs to update their "stale" pages while other sites like news can get away with it.