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? Address Thank you! Oops! Related Contents Tuning Your Social Security Benefit When should you take your Social Security benefit? Eight Mistakes That Can Upend Your Retirement There are common mistakes you can avoid when saving for retirement. An Inside Look at Retirement Living A number of questions and concerns need to be addressed to help you better prepare for retirement living.