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 Social Security: By the Numbers Here are five facts about Social Security that might surprise you. Thinking of Retiring Abroad? However exciting retiring abroad may sound, it deserves considerable planning. Self-Employed Retirement Plans Estimate the maximum contribution amount for a Self-Employed 401(k), SIMPLE IRA, or SEP.