Is this question philosophy or theology? I have worked alot with the terminally ill and am always asked this question. I wonder myself. I have heard it said that the person has fulfilled their potential and so its their time to pass on. That person and those who are left do not always agree!
Reiki cannot save a living being from dying but Reiki has been shown to ease the passing of the terminally ill and those who are old and in decline. Then once passed and when the time is right, Reiki is wonderful in relieving the pain of bereavement. So why then do we ask the question, why do the good die young? Perhaps we are saying that whatever their age, we who are left will miss those who are gone whether human or animal and would have wanted them with us always.