Mental illness is one of the largest areas of activity in the health service, with mental disorders of the elderly an important part of it. This substantial ageing of the population is a new phenomenon, occurring over the last century. It has given prominence to mental illness in old age. There is a growing interest in making decisions about how many and which services to provide to the older community.

The expertise of old age psychiatry services lies in the care and treatment of people with complex mixtures of psychological, cognitive, functional, behavioral, physical and social problems usually relating to ageing. Current evidence suggests specialist old age services are best equipped to diagnose and treat mental illness in our ageing population. However, the specialists should be integrated optimally into a service system to the benefit of the elderly. It will be crucial to improve access of older patients to the services. The service system and the partners in the system differ to those for younger adult psychiatric patients. Thus, not only knowledge and skills underline the necessity of specialization but also the increasingly complex health service structures of modern societies.