[Prevalence of anxiety disorders in people over 65 years-old: A systematic review].

Anxiety is an emotional problem that causes discomfort and suffering to those that suffer from it. Anxiety disorders can affect the functioning in different facets of a person's life. Studies on the prevalence of anxiety disorders in people over 65 years show variable results, ranging between 0.1% and 17.2%. Most of these studies include samples of the general population, in which the population of people over 65 years is under-represented. These studies evaluate older people with the same diagnostic tools used to assess anxiety disorders in people under 65 years, and collect data from people between 65 and 75 years old, leaving out people aged 75 and over. A systematic review of the prevalence studies of anxiety disorders in elderly people is presented. It is concluded that when representative samples of people over 65 years are used and evaluated with suitable tools, the prevalence rate of these disorders in the elderly is much higher than previously thought, reaching an annual prevalence rate of 20.8%.