I have a client whose site has been around for over 7 years and has a PR of only 1. He ranks on the first page for multiple, competitive keywords and all his competitors have a PR of at least 3. The only issue I saw were duplicate title tags throughout his e-commerce site. Could this be the reason for such a low PR? My personal site of less than 1 year has a PR of 2. This site is over 7 years old!