18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content Preparing For the Ultimate Vacation Make your retirement as exciting as your next vacation. When Should You Take Social Security Monthly Social Security payments differ substantially depending on when you start receiving benefits. Investment Strategies for Retirement Investment tools and strategies that can enable you to pursue your retirement goals.