In that case there may be something that needs to be corrected, like your mailing address. You can update your mailing address by logging in to or creating your personal my Social Security account.
What happens if I'm eligible for Medicare at age 65? When can I enroll?
Well, your initial enrollment period begins three months before your 65th birthday, includes the month you turn age 65, and ends three months after that birthday.
So all I need to do is to finish and submit my application?