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 How to Retire Early Retiring early sounds like a dream come true, but it’s important to take a look at the cold, hard facts. Systematic Withdrawals in Retirement Taking regular, periodic withdrawals during retirement can be quite problematic. Annuity Comparison This calculator compares a hypothetical fixed annuity with an account where the interest is taxed each year.