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? Social Security: The 64,000 Dollar Question One of the most common questions people ask about Social Security is when they should start taking benefits. Annuity Comparison This calculator compares a hypothetical fixed annuity with an account where the interest is taxed each year.