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? Share | Related Content Dreaming Up an Active Retirement When you retire, how will you treat your next chapter? What Is a Roth 401(k)? Roth 401(k) plans combine features of traditional 401(k) plans with those of a Roth IRA. Investment Strategies for Retirement Investment tools and strategies that can enable you to pursue your retirement goals.