but......I think that an old thread is okay to bring up if someone finds a thread that a problem hasn't been resolved and this person has a solution that might work that noone has mentioned yet. the person who posted it might see it and their problem might get solved because of it. I don't think it should matter what the date is on the thread.
now the general conversation threads in the social lounge, that is a different story, those should not be brought up, but as for the tech threads in the other sections, I don't think it should matter. Just my opinion