Question for the Club: What constitutes a classic?

Hi all,

I was just checking our recent comments (which come to us via email) and I saw one with a question that I’d like to put to the group:

What constitutes a Classic?

There are countless articles and essays that attempt to answer this question, but I don’t believe there exists a definitive answer.  Is it age?  Is it related to awards or honors?  Is it purely decided in the heart of its reader?

It seems that we had made an attempt to answer this question at some point in time.  However, our link is now broken and I can’t find the post!  So, let’s start a new one!  Tell us, how would you answer that question?