Different subtypes of geriatric depression exist, each one with its own clinical characteristics. Depressive symptoms often are accompanied by cognitive impairment. Various diagnostic studies must be done to evaluate late life depression, such as depression scales, neuropsychological test, laboratory analyses and Neuroimages. As regards to treatment, antidepressants are always the first line option, especially IRSS due to its effectiveness and low rates of adverse events. Antipsychotics may provide benefit for agitated, psychotic, or resistant MDD in the elderly. Mood stabilizers are useful in bipolar depression such as lamotrigine, lithium and divalproate. This review aims to define the different subtypes of geriatric depression, describe diagnostic methods and revise recent data about pharmacological treatment.