Retirement Read Time: 3 min Choose Your Own Retirement Adventure Related Content Deciding When to Take Social Security One of the most common questions people ask about Social Security is when they should start taking benefits. 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? Taxable vs. Tax-Deferred Savings Use this calculator to compare the future value of investments with different tax consequences.