18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Related Content Women and Retirement Women must be ready to spend, on average, more years in retirement than men. Retirement Traps to Avoid Beware of these traps that could upend your retirement. An Inside Look at Retirement Living A number of questions and concerns need to be addressed to help you better prepare for retirement living.