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 Leaving Your Lasting Legacy Want to do more with your wealth? You might want to consider creating a charitable foundation. Systematic Withdrawals in Retirement Taking regular, periodic withdrawals during retirement can be quite problematic. An Inside Look at Retirement Living A number of questions and concerns need to be addressed to help you better prepare for retirement living.