Military retirees must update their DEERS record and Retired Identification Card when becoming eligible for Medicare, normally at age 65. Once updated, a new ID card will never expire.
Also, the new ID cards no longer display your Social Security Number; there is a new DoD ID Number on the front and a DoD Benefits number printed on the back. If you have the old ID card, you can get a new one by making an appointment online at https://rapids-appointments.dmdc.osd.mil.
Remember to bring two forms of government issued identification. If you need to locate your nearest Identification office, use the DEERS/RAPIDS Site Locator at www.dmdc.osd.mil/rsl/.