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 Ready for Retirement? Are you ready for retirement? Here are five words you should consider. The History of Retirement Do you know where the idea of “retirement” comes from? Potential Income from an IRA Estimate your monthly and annual income from various IRA types.