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. Volunteering in Retirement For many, retirement includes contributing their time and talents to an organization in need. An Inside Look at Retirement Living A number of questions and concerns need to be addressed to help you better prepare for retirement living.