Rehabilitation in broad terms is a process aimed at restoring a person's functional capacity particularly in relation to activities of daily living. Studies have shown that hospitalization of older patients is a major risk factor for an often irreversible decline in function, and that functional decline from baseline occurs as early as day two of admission. Rehabilitation is therefore often required for older patients following an admission to an acute hospital. Older patients admitted for rehabilitation are more likely to be functionally impaired and are more medically complex than younger patients.