[Physiological changes of organs in old age].
The disease of old age considerably differs from the disease in adults. This is based on a decreased function of the organ systems caused by old age and on the multimorbidity which can regularly be proved at older age. The therapeutic peculiarities consist in the fact that the measures of rehabilitation become more and more difficult with growing age and that the effect of medicaments has changed by alterations of the water and fat content as well as of the cardiovascular system and the respiration caused by old age. By the mental restriction a deterioration of the observance rate of prescriptions of medicaments develops. Above all at old age there is often a gross discrepancy between the objectively recognizable findings and the complaints. Adaptability to the external conditions of a disease lead to the notion of the "conditioned health" also at old age.