A Fruitful Retirement: Social Security Benefit Taking your Social Security benefits at the right time may help maximize your benefit. Share | Related Content 18 Years’ Worth of Days The average retirement lasts for 18 years, with many lasting even longer. Will you fill your post-retirement days with purpose? Certain Uncertainties in Retirement The uncertainties we face in retirement can erode our sense of confidence. A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals.