They already had that feature. Just some questions were only valid at that time, so that the answer doesn't need to update, just leave them there as a historical reference. Some other questions, if you found an other answer recently, be nice and give your answer. If the question's author is still active, he will update the answer flag. Otherwise, users will upvote your answer when they find it useful for them and moderator will base on that to update the answer flag.
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They already had that feature. Just some questions were only valid at that time, so that the answer doesn't need to update, just leave them there as a historical reference. Some other questions, if you found an other answer recently, be nice and give your answer. If the question's author is still active, he will update the answer flag. Otherwise, users will upvote your answer when they find it useful for them and moderator will base on that to update the answer flag.