Ageing is a natural process. The one who is born is bound to age every second. The process of ageing starts right from the conception and continues through birth and till an individual dies. In this world nothing is stable. There is a time in one's body when all the systems in the body work till their maximum capacity. These duration of peak activity is not stable for a very long time. Subsequently there comes a stage when their is decline in the functional capacity of organ and the individual as a whole. This process of ageing is sequential and gradual. Further this process may vary from person to person. With the advancement in science and medical knowledge the average life span of human beings has increased. Thus resulting in large elderly population around the globe. Thus more the ageing population more the medical facility would be required. Think about country like India where we are fighting with Malaria, Dengue and polio like diseases how we can tackle heart diseases, kidney failures, strokes and cancer. So one of the best way to deal with these situations is to understand what happens during ageing. One can understand his limitations and can repair himself accordingly.    

Nervous system- With ageing, the weight of brain decreases. As the cells of brain shrink and they are not replaced by healthy cells. Further blood flow to brain also decreases by about 20%. The reaction time is prolonged and there is loss of capacity for postural balance. This can result in frequent falls faced by the elderly. Thus power of thinking and proper understanding of a complicated matter may not be as accurate as it was earlier. Psychological changes also occurs as we age. Elderly are emotionally more fragile. They may weep and cry over little issues.

Heart and blood vessels- The process of ageing affects the heart minimally when the person is at rest, but during physical exercises the changes can be seen. Under stress, the recovery time increases markedly. Blood vessels becomes stiffer and the elasticity is lot. This results in high blood pressure in elderly. But some communities may not affected by this but the individuals in which this process is going on they are at risk of strokes and kidney damage. In few elderly pulse rate may not be regular. As with ageing number of pulse activator cells decrease and the patients may feel vertigo and may fall. Thus there could be injury by irregular rhythm of the heart.