Gerontology and geriatrics are different. Geriatric medicine deals exclusively with the health and diseases of the elderly. Indeed, there are many diseases that affect mainly the elderly, due to the aging of organs over time: cataracts, dementia, deafness ... With the aging of the population due to the extension of life expectancy, geriatrics is a growing specialty and requires more and more practitioners. Geriatrics is a difficult branch of medicine, because it must take into account a multitude of parameters for better decision making: the various shortcomings of the organs including the heart, kidney, or liver, sensory disorders, and cognitive disorders (judgment problems, sometimes dementia) ... It requires comprehensive care, not only medical and psychological, but also social.