It was set to 60 days. I set it to a longer timeframe. But really if a post is getting that old, it can be transmogrified into a wiki, which any mod should be able to do a on a per-post basis. Or we can move to the FAQ section. We haven't really determined which is the best method for determining that yet, but happy to take suggestions.
I do wish there were forum software out there that enabled voting for things like trolling, me too's, thank yous, administrative stuff (like this)... Then a reader could ask to only see posts not marked as such. Not so much a problem in this thread, but there are some threads out there that would be useful is not for the other stuff.
If there's nominations for this kind of thing, I'd suggest doing with @hermit said and tagging the mod team for such a thing. We can take action from there.