Social Security and Medicare enrollment are not necessarily tied together. You can start Social Security benefits as early as age 62 and Medicare doesn't start until age 65. Thus, there is a potential for three years where you could receive a Social Security benefit without being enrolled in Medicare.
About four months before you turn 65, you will recive a "Welcome to Medicare" packet that will explain your options for enrollment and the various decisions that you need to make. For example. if you or your spouse continue to work and receive employer health insurance, you may not need to enroll in (and pay premiums for) Part B right when you turn 65.
For more information, refer to www.medicare.gov.
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