Right, Kitty. I never gave much thought to "invisible" illnesses, and there are so many.

My mom used to be hurt and miffed when she'd get impatient looks when she was crossing the street or navigating a store slowly, Back in the day, when she was in her 50's, her hair wasn't gray, she didn't use a cane, she looked healthy and robust. But she had angina, eventually having bypass surgery, and she was surely disabled.