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. The Cost of Procrastination Don't let procrastination keep you from pursuing your financial dreams and goals. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.