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. Are you prepared to fill that many days? What Is an Annuity? Annuities are versatile tools that can help you save for retirement and generate income in retirement. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.