This submission is composed of papers based upon a longitudinal study of ageing persons carried on in Edinburgh from 1968 to 1974. The subjects were 215 men and 272 women aged'63 -90 years who formed a simple random sample of the 27, 000 older people living in ten city wards in north Edinburgh in 1968. Examinations, relevant to this submission, were made by a physician, a psychiatrist and a dietician.The first examination was made in 1968 -69 with reviews after one (1969 -70) and five (1973 -74) years. The project was designed to study physical and mental health over this period and to record certain measurements. The year 1967 was spent planning the study, validating the questionnaire and learning to make reproducible measurements...