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 The Power of Tax-Deferred Growth Why are 401(k) plans, annuities, and IRAs so popular? Social Security: The $64,000 Question One of the most common questions people ask about Social Security is when they should start taking benefits. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.