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 Retirement Redefined Around the country, attitudes about retirement are shifting. Healthcare Costs in Retirement Without a solid approach, health care expenses may add up quickly and potentially alter your spending. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.