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? Retirement Income and the Traditional Portfolio Experiencing negative returns early in retirement can potentially undermine the sustainability of your assets. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.