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. Social Security: The $64,000 Question One of the most common questions people ask about Social Security is when they should start taking benefits. A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals.