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? Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Content Mutual Funds vs. ETFs Exchange-traded funds have some things in common with mutual funds, but there are differences, too. The Sequence of Returns A look at how variable rates of return impact investors over time. Taxable vs. Tax-Deferred Savings Use this calculator to compare the future value of investments with different tax consequences.