I imagine being older, as Mom is, as being like in a mental fog. Your body is there, but it seems heavy. Your limbs don't want to respond like they once did. Your eyes are not as sharp, you have to concentrate just to hear or see where once it was done without a thought. Your taste isn't what it used to be, and the joy out of eating a good meal is dramatically lessened. Many you have known are gone.

I can easily imagine a time when leaving this world despite it being the great unknown would despite that, seem preferable...