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 A Fruitful Retirement: Social Security Benefit Taking your Social Security benefits at the right time may help maximize your benefit. The Pre-Retirement Checklist This checklist can give you a quick snapshot of how prepared you are. Retirement Redefined Around the country, attitudes about retirement are shifting.