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 Women and Retirement Women must be ready to spend, on average, more years in retirement than men. Certain Uncertainties in Retirement The uncertainties we face in retirement can erode our sense of confidence. Retirement Redefined Around the country, attitudes about retirement are shifting.