18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Related Content A Fruitful Retirement: Social Security Benefit Taking your Social Security benefits at the right time may help maximize your benefit. Social Security: Maximizing Benefits There are other ways to maximize Social Security benefits, in addition to waiting to claim them. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.