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? Address Thank you! Oops! Related Contents Retirement Redefined Around the country, attitudes about retirement are shifting. Retirement Traps to Avoid Beware of these traps that could upend your retirement. Investment Strategies for Retirement Investment tools and strategies that can enable you to pursue your retirement goals.