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 RE: Retirement How does your ideal retirement differ from reality, and what can we do to better align the two? 9 Facts About Social Security There are things about Social Security that might surprise you. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.