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. What's So Great About a Rollover? Making a career move requires tough decisions, not the least of which is what to do with the funds in your retirement plan. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.