The IRS Rule of 55 allows an employee who is laid off, fired, or who quits a job between the ages of 55 and 59 1/2 to pull money out of his 401(k) or 403(b) plan without penalty. This applies to workers who leave their jobs anytime during or after the year of their 55th birthdays.
Of course, there is a slight catch you need to be aware of. The Rule of 55 only applies to assets in your current 401(k) or 403(b)—the one you invested in while you were at the job you are considering leaving at age 55 or older. If you have money in a former 401(k) or 403(b), it's not eligible for the early withdrawal penalty exemption. You would have to wait until age 59 1/2 to begin withdrawing funds from those accounts if you wanted to do so without paying the 10-percent penalty. One strategy to give yourself access to retirement plan assets with a former employer prior to age 59 1/2 is to roll those assets into your current 401k prior to retiring from your current job.