If you're pretty sure there isn't enough information to answer the question, you could close it as "unclear what you're asking". If you think you know what the asker is asking, you could edit the question to include those details to make the post more answerable.
As a moderator, you're empowered to take action when the community doesn't step in. On such an old post, it's not going to break anything if you close it unilaterally. If users want to see it opened, they can edit it to fix the problems and then vote to reopen, or come to this post and present a nice, constructive, well-reasoned, logical argument for reopening it. If that happens, you could choose to reopen it with just one click of your mouse. :D
As long as you're willing to help guide the community towards reopening it if that's what they want, you shouldn't have any problems. Hope this helps.