This is a delicate subject. Disability is a stage of life, but what worries me is the measurement of mental disability, knowing the important subjectivity of psychiatry, even though we can arrive at approximately similar diagnoses. This book brings you to address this issue that affects all ages. Schizophrenia, depression and dementia are some of the many causes of this form of disability. These people need multidisciplinary legal, health and social support. It should be added that old age is a normal process that is accompanied by memory loss, which is not necessarily dementia, a cause of disability, although it is frequent in the elderly.