Most people are eligible for Medicare when they turn 65. Some people will get Medicare automatically, and some have to apply for Medicare.
If you are already getting Social Security retirement or disability benefits (or Railroad Retirement benefits) when you turn 65:
You will be enrolled in Medicare Parts A & B (Original Medicare) automatically
You should get a “Welcome to Medicare” packet and Medicare card in the mail from the Social Security Administration about 3 months before your 65th birthday.
If you are not yet collecting retirement benefits:
You need to contact Social Security to apply for Medicare.
It is best to apply 3 months before your 65th birthday. If you do not apply, you will not be enrolled in Medicare.