18 Years Worth of Days Test Your Investment Knowledge! How much do you know about investing? Take our quiz and find out instantly. First Name Last Name Email Address Thank you! Oops! The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Have A Question About This Topic? Address Thank you! Oops! Related Contents Tuning Your Social Security Benefit When should you take your Social Security benefit? Social Security: The $64,000 Question One of the most common questions people ask about Social Security is when they should start taking benefits. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.