Dementing disorders are found most commonly in the elderly. However, t
he approaches derived from the diagnosis and management of these patie
nts exemplify principles which can equally well be applied to the mana
gement of psychiatric disorders in younger patients. These principles
include the process of syndromic diagnosis, the need for multi-dimensi
onal assessment, the recognition of the interaction of biological and
psyche-social factors in the etiology and treatment of psychiatric sym
ptoms and the crucial role of the family in the management of patients
with dementia. In this paper these principles are discussed.