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 Women and Retirement Women must be ready to spend, on average, more years in retirement than men. The History of Retirement Do you know where the idea of “retirement” comes from? Annuity Comparison This calculator compares a hypothetical fixed annuity with an account where the interest is taxed each year.