Know your Medicare Initial Enrollment Period before you turn 65
Added
Your first chance to sign up for Medicare is a 7-month window around your 65th birthday. If you miss it you may have to wait for a later enrollment period and pay a late-enrollment penalty. If you still have job-based coverage there are special rules, so check before you delay.
The result
Result: Medicare.gov: the window starts 3 months before you turn 65 and ends 3 months after the month you turn 65. A Part B late penalty can last as long as you have Part B.
Note: Not financial advice. General information only; check your own situation or ask a qualified professional.
Source
Medicare.gov (opens the original source in a new tab). Check it for the latest numbers before you act.