tedster - 5:34 am on Feb 7, 2011 (gmt 0)
Matt Cutts has said that google DOESN'T use that as a factor in ranking.
He spoke about that recently, too. Here's the link to the video: [youtube.com...]
The idea that length of domain registration is a factor got rolling after Google mentioned it in their Historical Data Patent [webmasterworld.com] and it might keep rolling for a few more years, just like other SEO mythology tends to. I'd prefer to kill it.