The report World Population Ageing 1950-2050 (United Nations, 2002) estimated that in 2005 there were 37.3 million elderly people (i.e. aged 65 years or more) in South-East Asia (a region incorporating Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Vietnam). There are only a few epidemiological studies on mental disorders among elderly people in this region and the published data are mainly from Singapore, Malaysia and Thailand. Using Singapore's prevalence rate of 3% for dementia and 5.7% for depression, the numbers of elderly people with dementia in this region would be 1.2 million and with depression 2.12 million (Kua, 1992; Kua & Ko, 1995). However, even in Singapore, we have identified only 10% of all potential cases of dementia and depression - meaning that the large majority of elderly people with mental disorders are not detected, although they may be known, for other reasons, to the health services.