18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Related Content A Fruitful Retirement: Social Security Benefit Taking your Social Security benefits at the right time may help maximize your benefit. How Will Working Affect Social Security Benefits? Knowing the rules may help you decide when to start benefits. An Inside Look at Retirement Living A number of questions and concerns need to be addressed to help you better prepare for retirement living.