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? Social Security: What’s Changing in 2016? There have been a number of changes to Social Security that may affect you, especially if you are nearing retirement. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.