When analyzing why your competitors rank well in the SERPs, it may be helpful to include the age of the site in the analysis. While I would like to see this component included in some of the more comprehensive analysis tools on the web, I have not yet seen one that does. Still, there is a tool that you can use as a stand-alone tool at www.123promotion.co.uk/tools/age-of-website.php. After you have gathered the analysis info from other tools, run this tool on the top 10 or 20 competitors and see if the age factor plays any part in the overall analysis.