How to deal with obsolete answers?
This was already asked from question poster's side, but what about answer posters side? I've have had recently received down-votes on answers that were correct, up-voted and even accepted two years ago (an example). Now they are outdated, sometimes even not correct in current circumstances. So what should I do about them? I have way over thousand answers on SO and other SE sites, so reviewing all of them is out of the question.