Many questions (often old) holds the proper answers sometimes in the comment section, or as an answer but are not marked answered.
What if users with high reputation could mark the question as "Closed" or "Answered". That could even need to be reviewed.
I'm not saying that they could choose which answer is the correct one. The point is to provide a way to close them, because those questions are still showing in the unanswered list even if in practice they answered.
I believe this is a problem because the community will tends to be reluctant to provide answers for old questions in general, because they might never be marked answered anyway.
Thus, the old questions that really needs answer are mixed up among them. So, it becomes harder to be efficient at looking for Unanswered questions.
Any opinion about that?