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? Related Content Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable. Will Power Preparing for the eventual distribution of your assets may not sound enticing. But a will puts the power in your hands. Timing Your Retirement This short video illustrates why knowing when to retire can be a crucial part of your strategy.