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 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. Investment Strategies for Retirement Investment tools and strategies that can enable you to pursue your retirement goals.