Age, the faded star on the horizon, followed inadvertently but consistently by a column of weary pilgrims among whom all of us will be gradually included, is nothing but a clear indication of humans returning to where they started — in the bosom of picturesque nature. How nice it would be to go back there without pain, in a good mood and smiling. How nice it would be — even at this stage of life — for the eye to enjoy gazing into the face of a good person, the heart to feel the warm spell of reciprocated love, the joints to move freely and the brain to kindle an optimistic mood every day. In fact, it is often a little different. Worn mechanical parts of the body's machinery squeak in horror, muscles become weak from inactivity, eyes lose their eagle's sharpness and a heart that once liked to love must contend with itself for survival. How easy it is in this state to succumb to despair, often exacerbated by watching that star fade more and more on the horizon of a disappearing future. However, is this despair in old age not commonplace? Is an enjoyable trip back to eternal and beautiful nature no longer possible? Yes, of course it is. For those who are heading in this direction and working a little on themselves, it is possible but, of course, it requires a rather strong will. The sooner it starts, the better, but it is never too late to work so that the body does not suffer and the brain is kept active. Do not let your brain rest, because you can further the beneficial effect of brain activity on mental freshness and overall attitude towards life in old age. As long as possible, the freshness should let you see and experience the world and events around you with delight. This book, riding on the echoing waves of the motto 'Do not leave room for nothingness', pursues this aim.