Elasticity is absolutely necessary for living a normal life. This fact is cruelly revealed when respiratory, cardiac, digestive, sensory, motor, reproductive or aesthetic problems appear following the inexorable decline of our elastic capital. The protection and maintenance of this capital is one of life's priorities since this declination begins at the age of twenty and accelerates in times of crises and pandemics. However, there are no therapies yet designed to remedy it. The first part of the book explains the consequences surrounding a lack of elasticity in the skin, the most visible decline, and then other defects in elasticity throughout our bodies, exploring places rarely mentioned. The second part describes the research fighting against elasticity anomalies and examines useful behaviors to protect our elastic capital ( our diets and physical and cognitive activities). This last point is at the heart of current social debates on nutritional, behavioral, environmental and even ethical levels.