Not everyone pays the same Medicare premiums. Why? Income-Related Monthly Adjustment Amount (IRMAA). The income you brought in TWO YEARS AGO determines your Medicare premiums today.
What if TWO YEARS AGO I was working and making a lot of money, but now I'm retired and my MAGI is much less? Am I stuck paying the higher premium for the next 2 years?
Nope. Life-changing events, including "work stoppage", give you a ticket to appeal. The secret is knowing that this form exists and sending it in immediately. Form SSA-44.