There are three possibilities of intervention for the gerontological departments of the great hospitals of mental health. While as a first step the medical and psychiatric first aid is given in the admission departments, special departments for rehabilitation and daycare offer as well programs for social training, such as cooking, shopping, traffic lessons, contact to offices etc., which accelerate the resocialisation of mentally handicapped old people. From the participation of the patient in a list of activities we gain hints to the possible result of rehabilitation. Ambulance and visits of a psychiatric consultant in the institutions of the local care for the aged complete the therapy program in the part of prevention and after treatment.