When taking leave of one another, we often say, "Be well." Perhaps we should be more precise and a bit more practical. Reasonably, we can't expect everyone to healthy all the time. Good wishes should be more realistic:
"I hope you remain reasonably healthy during the next eighteen months or so, and if you have a stroke, I hope it only paralyzes you on one side, leaving you free to take phone calls."
I think people would appreciate such thoughtfulness and precision.