This text combines a scientific and medical description of ageing with a critical review of ways to prolong life. The first part gives an overview of the complex biological mechanisms of ageing and of the consequences of tissue and system ageing in humans. The role of genetic and environmental factors influencing the rate of ageing in several species is discussed. The second part of the text evaluates the various means that may slow down the physiological and psychological effects of ageing - such as life styles, behavioural variables, medical interventions and vitamin supplementation. Biotechnology and gene therapy are also becoming a part of medical interventions to prolong life.