Check out this latest post from SEO guru, Aaron Wall on why Google loves “old” web sites:

http://www.seobook.com/why-google-trusts-old-websites-so-much

As I have said to clients many times, this poses tremendous opportunities for law firms that posted a “brochure” type web site a few years ago and have not done much with it since then. Whether you know it or not, your “old” web site has likely attracted some trust and value in the eyes of Google. However, you are likely not taking full or even much advantage of that trust and value if your site has stayed static for any considerable period of time. A relaunch of such a site can bring tremendous SEO gains if the site is redesigned with proper SEO concepts in mind. You can get an even bigger boost if you redesign your site using a content management system and then actually use the CMS to update your site regularly. This is an easy and relatively inexpensive way to get much better internet visibility for your firm.