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 Tuning Your Social Security Benefit When should you take your Social Security benefit? Estimate Your RMD Help determine the required minimum distribution from an IRA or other qualified retirement plan. Investment Strategies for Retirement Investment tools and strategies that can enable you to pursue your retirement goals.