Medicare question

[jrfan]

I’ve been at my current job for 38 years and have been thinking about retiring. I have spoken with the retirement board and they told me my health insurance will go up from 550.00 month to 1700.00 a month when I leave( Im 57 now) I asked if that would go down once I reach 65 because of Medicare and she said no. When I was hired they did not take Medicare out of my check and I have been grandfathered in since. I am 20 credits shy of having the 40 I need to
Qualify. My question is can I buy Medicare points or will I have to work somewhere that takes out Medicare for a few years to get those points?