18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Related Content RE: Retirement How does your ideal retirement differ from reality, and what can we do to better align the two? Inflation - Back to the Future Even low inflation rates over an extended period of time can impact your finances in retirement. Inflation & Retirement Estimate how much income may be needed at retirement to maintain your standard of living.