18 Years’ Worth of Days The average retirement lasts for 18 years, with many lasting even longer. Will you fill your post-retirement days with purpose? 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. What's New for Social Security? There have been a number of changes to Social Security that may affect you, especially if you are nearing retirement. Saving for Retirement This calculator can help you estimate how much you may need to save for retirement.