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 Retirement Redefined Around the country, attitudes about retirement are shifting. 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.