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 Don't Buy The Hype There are a lot of misconceptions about Social Security. Here’s the truth about three of them. Systematic Withdrawals in Retirement Taking regular, periodic withdrawals during retirement can be quite problematic. Inflation & Retirement Estimate how much income may be needed at retirement to maintain your standard of living.