The Power of Tax-Deferred Growth Why are 401(k) plans, annuities, and IRAs so popular? Share | Related Content 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? What Is an Annuity? Annuities are versatile tools that can help you save for retirement and generate income in retirement. Investment Strategies for Retirement Investment tools and strategies that can enable you to pursue your retirement goals.