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 Rightsizing for Retirement What does your home really cost? Inflation - Back to the Future Even low inflation rates over an extended period of time can impact your finances in retirement. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.