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 Mentorship for Entrepreneurs: An Invaluable Resource Entrepreneurship can be a rewarding but solitary pursuit. Social Security: Five Facts You Need to Know Here are five facts about Social Security that are important to keep in mind. Infographic: Playing the Odds With Your Future? Plan for the things you can protect against, like a loss of income due to illness or injury.