Since technical problems after a year need usually be looked into with a new perspective I wanted to suggest to auto-close threads after 12 months.
That way users would write their problem. Given that the codebase is changing constantly, I don’t think it makes sense to ask a couple of years about “having the same problem” without new information.
The user can still reference the old thread if they believe it is relevant.
Exception would be the Feature Requests, since they will be closed once resolved I guess.
Just for your consideration.