@vanish726
Generally you do not lose medicare due to age- as it's a federal program.
Even if he chooses not to pick up the supplemental insurance he still has basic coverage for doctors & hospitals.
You may check on your states market place for insurance options even with pre existing conditions they will find a plan for you.
I've been dropped 4x by insurance companies in the last 3 years for pre existing conditions -
It's frustrating !
Deep breath. You can do this.