I know it was asked many times here and the historical significance should be taken into account in dealing with those questions: some highly upvoted old questions would be closed immediately if asked today.
But still I'm not sure:
- At which age or upvotes question becomes historical significant enough not to vote to close?
- Should I even flag those questions if I'm not sure what to do? We have 118k close votes review queue today, so I guess I should vote to close only in most serious cases?