18 Years Worth of Days 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 Rightsizing for Retirement What does your home really cost? Caring for Aging Parents As our nation ages, many Americans are turning their attention to caring for aging parents. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.