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? Related Content Social Security: Five Facts You Need to Know Here are five facts about Social Security that are important to keep in mind. When Does Your Personal Car Become a Commercial Vehicle? At what point can you call a personal vehicle commercial? Building a Solid Financial Foundation Sustain financial well-being or create wealth through these actions.