Hi Roo
First, authors
love to get feedback, no matter how old the fic.
So no problem there! I see your point about advertising stories you loved to other newbies, though, which is a great idea.
But if it's a story you read on the Archive, the fanfic folder isn't really the most appropriate.
However... why not use this folder? Someone - I think it was Sara - started a thread some weeks ago entitled 'feedback I always meant to send' - you could use that. Or you could start a thread and call it something like 'getting to know older fics?' and invite others to post about older stories they might have just read recently.
Wendy