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? Choices for Your 401(k) at a Former Employer Individuals have three basic choices with the 401(k) account they accrued at a previous employer. Estimate Your RMD Help determine the required minimum distribution from an IRA or other qualified retirement plan.