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 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. Saving for Retirement This calculator can help you estimate how much you may need to save for retirement.