First, let me say I believe in the Golden Rule. Whoever owns the Gold Rules.
So, if I don't like the rules on a board, I can go elsewhere. Okay?
Having said that any board I have run or served as a moderator. I do not discourage postings on old threads. If the person took time to read an old posting and wants to post on it, that is great.
Once, over ten years ago, I was using, very successfully, I might add, the Atkins Diet, and still am. I found a board on the Diet, and there was an old thread which gave some erroneous and dangerous advice. I added a note explaining why. The moderator threw a major tantrum. Beam me up, Scotty!
My view, then and now, is if it is that offensive to post on an old thread, set up an auto delete. That is my opinion, subject of course to the Golden Rule as described at the start of this posting. Do you have any idea how frustrating it is to read an interesting posting and have something to say, but can't, because it was an old posting. Grrr!
I certainly like the very mature approach implemented on this board. Make sure they know it is old, but give them the freedom to make an adult decision if they have a strong desire to add something. Showing once again the superior intelligence of the owners. Good job!