18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Contents Rightsizing for Retirement What does your home really cost? How Will Working Affect Social Security Benefits? Knowing the rules may help you decide when to start benefits. An Inside Look at Retirement Living A number of questions and concerns need to be addressed to help you better prepare for retirement living.