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 The Power of Tax-Deferred Growth Why are 401(k) plans, annuities, and IRAs so popular? How Will Working Affect Social Security Benefits? Knowing the rules may help you decide when to start benefits. An Inside Look at Retirement Living A number of questions and concerns need to be addressed to help you better prepare for retirement living.