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 Women and Retirement Women must be ready to spend, on average, more years in retirement than men. The History of Retirement Do you know where the idea of “retirement” comes from? Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.