Ever more frequently I find in the "close votes" review queue questions which are a few years old. Many of them already have accepted answers, and one can see that they were well received at the time when they were asked.
I'm sure that the site and its notion of "good question" have been changing (and will keep changing) over time. I thus think that old questions must be protected in some way.
Do others agree with this? And if so, how can this be implemented?