So far, the only thing I can think about is to search for the footprint: Copyright 2000, Copyright 2001, and so on until 2020. Obviously, it's not a guaranteed success but usually people that are maintaining their site update the Copyright every year.
Otherwise, I thought about searching Google by date range but it doesn't really work. I just did a search for articles that were 3 years old or older, I found a bunch of sites but all of them had been updated since. It was only the articles that were old.
So anyone? Any ideas or thoughts?
Thanks a lot in advance.