sem4u - 2:47 pm on May 22, 2008 (gmt 0)
I don't think that length of domain registration stands for much on its own. Older domains that have been active since they were registered may count for more. Think of all of the old links that they have picked up over the years. A couple of the sites I am working with were launched in 1999, and I expect that when SEO changes are made, the sites will receive a fairly large increase in traffic, as they will be seen as more trustworthy than sites launched much more recently.