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. Choosing a Retirement Plan that Fits Your Business To choose a plan, it’s important to ask yourself four key questions. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.