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 Retirement Redefined Around the country, attitudes about retirement are shifting. Social Security Benefits: How Much Will I Receive Calculating your potential Social Security benefit is a three-step process. An Inside Look at Retirement Living A number of questions and concerns need to be addressed to help you better prepare for retirement living.