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Perhaps the best way to deal with your SO content is to note in a comment that the canonical answer is no longer maintained by the canonical author, and / or maybe change your username to "username...
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#1: Initial revision
Perhaps the best way to deal with your SO content is to note in a comment that the canonical answer is no longer maintained by the canonical author, and / or maybe change your username to "username - no longer updating answers since dd/mm/yyyy" if that's your stance across the whole site, to get the message across. That way you protect your own reputation by highlighting that the content is being allowed to go stale and should no longer be relied on, but at the same time by allowing it to rot you do nothing to help SO (because frankly a deleted answer can be better than one that has been allowed to become horribly out of date, and if others follow a similar approach eventually the SO rot will start to show and their reputation will suffer.