Ключевые слова: aging, background, body, brain, care, concept, degenerative, dementia, diagnosis, difficult, disability, disease, disorder, dopamine, grey, grunge, health, help, illness, medicine, mental, motor, muscle, nervous, neurological, neurology, object, parkinson, parkinsonian, parkinsonism, patient, pieces, prevention, problem, protection, puzzle, quaking, shaking, sickness, symptom, syndrome, text, top, treatment, tremble, trembling, tremor, view, word,