In order to make a success of old age, one must begin it earlier, and not try to postpone it as long as possible. In the middle of life we must stop to think, to organize our existence with an eye to a still distant future, instead of allowing ourselves to be entirely sucked into the professional and social whirl. It is then that it is important to give place little by little to less external activities, less technical and more cultural, which will survive the moment of retirement.