I believe some old questions would be quickly closed if asked today (e.g., What is sound and how is it produced? in my opinion is too broad and shows too little prior research effort).
What should we do?
- always leave them alone, 5+ years is history;
- consider voting to close, but only if there aren't very good answers "rescuing" it;
- not take the question's age into account at all when casting votes;
Of course, voting is a judgment call, my question is how (and whether) to take the post age into consideration.
The answer and discussion in the question Enforcing new policies to old questions/answers shows we don't shy away from disturbing archaeological questions in case of a policy change, but I'm not convinced the situations are equivalent.