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 Tap Retirement Savings to Fund College? There are three things to consider before dipping into retirement savings to pay for college. Three Key Questions to Answer Before Taking Social Security When to start? Should I continue to work? How can I maximize my benefit? A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals.