The truly evolved individual makes the intention to live as long as they can learn lessons and be of service to others, and once that has occurred, they choose to exit this lifetime. You have seen very often in friends, families and acquaintances, those whose life seems to have come to completion and they cross over. Their work is done; they have finished the course of their life, the race is done, and so they cross the finish line and move on. --Monjoronson