The title of this thread is "Should Old Posts Die?" What does that mean exactly? Define death of a post.
The first post in this thread clarifies.
"Is it necessary to revive dead posts?"
Most of the answers to this thread have been to a third question.
"Should old posts be completely deleted with no evidence that they ever existed at all?"
In response to the original question. Old threads are just as legitimate as any other thread, just because its old makes no difference if someone is interested in it and wants to talk about it, then at that point it becomes new again. And in that last sentence I believe there are many parallels to life if anyone wants to think about it.