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 Rightsizing for Retirement What does your home really cost? 9 Facts About Retirement Regardless of how you approach retirement, there are some things about it that might surprise you. An Inside Look at Retirement Living A number of questions and concerns need to be addressed to help you better prepare for retirement living.