18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Related Content Retirement Redefined Around the country, attitudes about retirement are shifting. Should You Borrow from Your 401(k)? Does it make sense to borrow from my 401(k) to pay off debt or to make a major purchase? Investment Strategies for Retirement Investment tools and strategies that can enable you to pursue your retirement goals.