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The following thesis, informs us about the issue of aging, as well as the individual changes that take place in the body of older people and more specifically in their organic systems. The first chapter presents an elementary reference to the definitions of old age, its basic theories as well as some useful demographics, prerequisites for understanding its characteristics. One of the most heavily affected systems by old age is the musculoskeletal system, which exhibits remarkable degeneration both in bone and joint structure and in muscle function. In addition, significant lesions occur in both subgroups of the nervous system with more extensive literature being located in the central and significantly smaller in the peripheral. The structures and functions of the vestibular system also undergo changes over time, which lead to a series of disorders that impair the quality of life of the elderly. Two other systems that couldn’t remain unaffected during old age are the respiratory and cardiovascular. As far as the first is consered, there is a variety of anatomical and functional changes responsible for the occurrence of respiratory infections, while in the second, vital diseases occur, due to changes in the heart and the basic structures that make up the cardiovascular system. Aging, among other things, results in a number of skin, eye and ear changes that negatively affect touch, eyesight and hearing, respectively. In the digestive, reproductive, renal, immune and endocrine systems, there are also age-related changes that result in the appearance of numerous health disorders. Finally, movement and balance coordination disorders are some of the effects of the influence of old age on the proprioceptive system. In the discussion that follows the main topic is a comparison between numerous articles.