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 RE: Retirement How does your ideal retirement differ from reality, and what can we do to better align the two? Systematic Withdrawals in Retirement Taking regular, periodic withdrawals during retirement can be quite problematic. Investment Strategies for Retirement Investment tools and strategies that can enable you to pursue your retirement goals.