I'm not quite sure if I'm going to be able to explain this properly but I'll try.
How old is too old when replying to a thread? As in, how old does a thread have to be until you wouldn't comment on it.
I was wondering because of the zombie threads that pop up now and then. I like to read the MN classics sometimes, and occasionally think of something I'd like to add, but don't as it would resurrect a zombie thread.
I don't mean the threads where the OP was looking for an answer to something immediate. I was thinking more about the threads where people add funny experiences etc...