Sri Aurobindo
Letters of Sri Aurobindo
05. The Triple Transformation: Psychic – Spiritual – Supramental
It depends on the consciousness. As it is, at present, most people do not get tired of life; they die because they must, not because they want to – at least, that is true of the vital; it is only a minority 
that tire of life and for many of these it is due to the discomforts of old age, continued ill-health, misfortune. Supposing a consciousness descended in the body that got rid of these discomforts, would people get tired of life in the same way merely because of its length or would they have some source of perpetual interest within as well as without, that would keep them on – that is the question. Of course physical immortality would not mean that one is tied down to the body, but that one is not subject to disease and death, but can keep or leave the body at will. I don’t know whether Ashwatthaman1 lives on because he cannot die or because he won’t die – whether it is for him a doom or a privilege. There are by the way animals that live for many centuries, but as they have not the philosophic mind the question for them does not arise – probably they take it as a matter of course.