The improvement in living conditions and considerable medical progress over the past 50 years have brought current life expectancy to around 80 years and probably beyond 90 or 100 for the younger generations. Along with this increase in lifespan, the desire to prolong the period of active life has also increased, with strong social pressure linked to performance and appearance, the very image of aging having become insidiously synonymous dulled capacities and less dynamism. In the book you are holding in your hands, the authors reveal the YOUTH program, intended to STAY YOUNG AND FOR A LONG TIME.