Health and disease among the oldest old: a clinical perspective.

Interactions of aging and disease are poorly understood by both clinicians and the aged themselves. The altered expressions of illness in the oldest old--in severity, presentation, and perception--provide a clinical challenge to treatment as well as to the formulation of health policy. A progressively diverse population, the oldest old will require new strategies for individualized care (acute and long-term), case-finding, research and training, and health promotion.