This is a common situation, but if you have any special circumstances, you will want to talk to a Medicare expert to avoid any problems.
If you continue to work past your 65th birthday and are covered under a group health plan based on current employment, you will probably want to defer enrollment into Medicare. Once you retire, you will be given an eight-month Special Enrollment Period that begins the month after employment ends or your group health insurance ends, whichever happens first. As long as you enroll during this Special Enrollment Period, you won’t be assessed with any late enrollment penalties.