And what if I don't get monthly payments at all?
Then you'll get a separate bill from another federal agency, such as the Centers for Medicare & Medicaid Services or the Railroad Retirement Board.
by the way, for a medicare application, can i be eligible for this same at age 65?
You can, and if you are, your initial enrollment period begins three months before you turn 65, including the month you turn 65 and ends three months after that birthday.