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 Should You Tap Retirement Savings to Fund College? There are three things to consider before dipping into retirement savings to pay for college. 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.