[To the question of borderline case between psychology and psychopathology in higher age (author's transl)].

Proceeding from the general problems of geropsychiatric lines of research, a number of developments of psychitc functions (intelligence, memory, speed of psychic-cognitive and psychomotor processes, cerebral fatigue, concentration power, higher perception functions) are discussed in dependence on the age. The paper explains that the process of ageing has different effects on the various psychic subfunctions. This fact is of great significance for rehabilitative measures for old-age people.