Another interesting karmic relationship is between an habitually selfish attitude and a loving sympathy with others. Some people are hardened egoists — not only in their acquisitiveness — and others are unselfish and sympathetic. Both attitudes depend on the etheric body and may even find expression in the physical body. People who in one life have been habitually selfish will age quickly in their next life; they seem to shrivel up. On the other hand, if in one life you have been ready to make sacrifices and have loved others, you will remain young and hale. In this way you can prepare even the physical body for the next life.
Source: Rudolf Steiner – GA 95 – At the Gates of Spiritual Science – Lecture VIII: Good and Evil. Individual Karmic Questions. – Stuttgart, 29th August 1906