18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Related Content How to Retire Early Retiring early sounds like a dream come true, but it’s important to take a look at the cold, hard facts. When Should You Take Social Security Monthly Social Security payments differ substantially depending on when you start receiving benefits. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.