While editing older questions (one year+) from time to time, I also place close-votes on some.
Is it worth? Or is it just totally useless because of the age of the question?
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At the very least, the question will be placed in the Close Votes review queue, so it's not a waste. (I know there are 50k questions in there right now, but we'll clear that thing eventually.)
If the question should be closed, vote to close it. Don't worry about what happens after that. :-)
If you've edited the question, it'll show up on the active list, and so people may see it and agree with you. Or they may not. Close-votes on questions have no negative effect except on the question (and questioner's rep, if it gets closed as NARQ or OT resulting in a Community downvote, or you also downvote it), so...