I have mentioned this issue many times –it’s called the IRMAA adjustment, and basically it increases your Part B premium if your income is higher than the brackets. I often mention this in conjunction with cashing in Savings Bonds or doing Roth Conversions or taking larger retirement plan distributions.
Here is a link to the specific IRMAA adjustment levels: https://www.socialsecurityintelligence.com/the-2023-irmaa-brackets/
It should adjust downward as they review your subsequent lower income years. But you can also appeal if they do NOT lower your premium next year. Here’s some information on that process from Medicare.
Thanks for buying my books for your daughters. Sadly, for your Part B premiums, it’s an old Savage Truth that the lessons that cost the most, teach the most!!