18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Related Content Should You Ever Retire? A growing number of Americans are pushing back the age at which they plan to retire. Or deciding not to retire at all. Certain Uncertainties in Retirement The uncertainties we face in retirement can erode our sense of confidence. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.