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? Share | Related Content A Fruitful Retirement: Social Security Benefit Taking your Social Security benefits at the right time may help maximize your benefit. Healthcare Costs in Retirement Without a solid approach, health care expenses may add up quickly and potentially alter your spending. Inflation & Retirement Estimate how much income may be needed at retirement to maintain your standard of living.