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? The Pre-Retirement Checklist This checklist can give you a quick snapshot of how prepared you are. Annuity Comparison This calculator compares a hypothetical fixed annuity with an account where the interest is taxed each year.