Low diastolic pressure (less than 70 mmHg) in people over 75 years of age is associated with a higher risk of dementing disorders. This risk appears to apply only to dementia disorders of the Alzheimer's type and is higher in people with low blood pressure of a persistent nature.

a 21-year study of 406 older people living under the same roof. None of the subjects were diagnosed with dementia disorders at the start of the study.