The History of Retirement Full Size Version Share | Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content 18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? What Is a Roth 401(k)? Roth 401(k) plans combine features of traditional 401(k) plans with those of a Roth IRA. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.