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. 5 Benefits of Working in Retirement Here are 5 reason why you may consider working through retirement. Tuning Your Social Security Benefit When should you take your Social Security benefit?