Christ had given the apostles a world-wide commission, embracing all the nations; but intellectually they did not understand what He meant. They found that out as they followed the impulse of the Spirit.
The prime goal is to alleviate suffering, and not to prolong life. And if your treatment does not alleviate suffering, but only prolongs life, that treatment should be stopped.
As long as you smile, have sparkly eyes and stick your shoulders back, nobody's going to notice your bum or your waist or your feet, for that matter.

