Introduction Not unlike other degenerative disorders, the incidence of dementia increases with age; one in 15 persons aged over 65 years of age will have moderate to severe dementia which increases further to one in nine for those 80 to 84 years old and one in four in those aged over 85 years (Henderson 1998). These figures provide a frightening reality check for the health industry given the aging population in developed countries. With the over 65 and over 85 demographic groups increasing in both relative and absolute terms, one might expect similar relative and absolute increases in dementia cases; longer life expectancy tends to be accompanied by increased morbidity associated with aging. While people living in developed countries are living longer, the morbidity of aging may be exacerbated (including heart disease, cancer and dementia). Measures to maintain cognitive function could extend significant benefit to quality of life and health care costs.