No one that I am aware of MUST enroll in Medicare at 65.
Yes, that’s what about 300 folks at a retirement seminar thought. But we were all told that at 65 you must sign up for Medicare, that’s everyone!
No, but the Administration thinks that it can hold your Social Security payments hostage in order to force you to enroll in Medicare:
http://spectator.org/blog/2011/01/17/mugged-by-medicare