If a question is
- a month or more old
- has the score of 0
- has no answer
there is no need to close it. If you find it's unclear or otherwise unsuitable for the site, just downvote it. With the score of -1, it will be automatically deleted by a script that runs weekly.
There are few people who review closevotes regularly on the site. I used to do it more often, and am trying to get back to doing it now, but I'd rather not face a stream of mind-numbingly boring, long-forgotten posts unless it's necessary.