Aging is a gradual and continuous process that leads to a decline in bodily functions over time. With an increase in age, the brain and nervous system go through some natural changes such as losing nerve cells and weight. The process of passing messages also slows down with age. As a result of the breakdown of nerve cells, waste products and other chemicals get accumulated in the brain tissues. This may lead to abnormal changes in the brain and buildup of fatty brown pigment in nerve tissue. Breakdown of nerves can lead to reduced or lost reflexes, resulting in problems with movement and safety. Different approaches, evaluations, methodologies and advanced studies on the changes in nervous system with age have been included in this book. It explores all the important aspects of this field. This book will provide comprehensive knowledge to the readers.