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 Preparing For the Ultimate Vacation Make your retirement as exciting as your next vacation. Split Annuity Strategy Here's one strategy that combines two different annuities to generate income and rebuild principal. Annuity Comparison This calculator compares a hypothetical fixed annuity with an account where the interest is taxed each year.