According to the California Department of Motor Vehicles there are currently over 2.5 million California drivers over the age of 70 and 5.5 million over the age of 55.  To put that in perspective there are more senior drivers in CA than there are residents in Oregon and Nevada combined!  

Now the good news.  Because our friends at the California DMV want to help seniors maintain their independence and safety as long as possible they now offer many of their services online and have created a special web page just for senior drivers.  Check out the details at DMV Seniors.