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 Retirement Redefined Around the country, attitudes about retirement are shifting. Eight Mistakes That Can Upend Your Retirement There are common mistakes you can avoid when saving for retirement. Saving for Retirement This calculator can help you estimate how much you may need to save for retirement.