To answer your question first Rick.
I kind of see that particular guidline as a way to get feedback on your current work, work that shows where your photography is right now. A lot of "photo clubs" have a similiar "rule" for their competitions. It's not that work older than two years isn't worth while. I think that showing current work will help you grow better as a photographer.
I think that showing older work should be done elsewhere, like Viewfinder. Like that, "Post a Photo From The 90's" thread I started a while ago.
I know there is a lot to be gained by looking at older work, it's just that I don't think it works here.
Make sense?

I can see what you are talking about GB, I guess I didn't think about series stuff. I was thinking of posts that contain multiple random photographs.

I hear you Gary, critiquing anothers photographs is also about creating a relationship with the other photographer. So the more photographs you comment on, the more likely you are to have your own photographs commented on too.

Brian