18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Have A Question About This Topic? Address Thank you! Oops! Related Contents Women and Retirement Women must be ready to spend, on average, more years in retirement than men. Three Key Questions to Answer Before Taking Social Security When to start? Should I continue to work? How can I maximize my benefit? Inflation & Retirement Estimate how much income may be needed at retirement to maintain your standard of living.