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 The Power of Tax-Deferred Growth Why are 401(k) plans, annuities, and IRAs so popular? Certain Uncertainties in Retirement The uncertainties we face in retirement can erode our sense of confidence. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.