.0001) and axial score (p = 0.0001) assessed postoperatively in "on" medication and "on" stimulation conditions appeared worse in old patients as compared to young patients. Improvement in the Schwab and England Scale score was better in young patients in "on" (p<0.0003) and "off" state (p<0.001). Quality of life assessed with the 39-item Parkinson's Disease Questionnaire showed an improvement in subscales evaluating mobility (p<0.0001), activities of daily life (p<0.0001), emotion and stigma (p = 0