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 Retirement Redefined Around the country, attitudes about retirement are shifting. 9 Facts About Retirement Regardless of how you approach retirement, there are some things about it that might surprise you. Investment Strategies for Retirement Investment tools and strategies that can enable you to pursue your retirement goals.