For the most part, people griping about bumping old threads has little to do with the age of the thread, and everything to do with the post itself. It's often the case that the question's already been answered, the post adds nothing to the discussion, and a vicious cycle begins as people don't read the earlier posts to see what's already been said. I've benefited from a bumped post before, but that's only when the additional information is thoroughly explained, and contains a new insight relevant to the main topic.
Note: IR has branched my discussion into a
second thread.