Part B Late Enrollment Penalty

I have a prospect who is turning 65 next month. He has had Medicare Part A for several years due to disability but now wants to enroll in Part B and get a Supplement because he is displeased with the care he has been getting at the VA. When he called SS to enroll in Part B he was told he would have to wait until he reached age 66 to avoid late enrollment penalty. He was told that at age 66 his disability benefit would automatically be changed to a retirement benefit and that is why he needed to wait to avoid the late enrollment penalty. I thought he could go ahead and enroll in Part B with

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