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? Name Email Address Question Thank you! Oops! Related Contents Retirement Redefined Around the country, attitudes about retirement are shifting. Three Key Questions to Answer Before Taking Social Security When to start? Should I continue to work? How can I maximize my benefit? A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals.