INTRODUCTION: Subthalamic nucleus deep brain stimulation (STN-DBS) effectively improves motor symptoms in Parkinson's disease (PD), but long-term survival outcomes and mortality predictors remain unclear. This study aimed to evaluate survival and 10-year clinical outcomes after STN-DBS. METHODS: We retrospectively analyzed 608 patients with PD who underwent bilateral STN-DBS between 2006 and 2023. Kaplan-Meier and Cox regression analyses assessed survival and preoperative predictors. Motor (Movement Disorder Society Unified Parkinson's Disease Rating Scale [MDS-UPDRS Part III]), cognitive (Montreal Cognitive Assessment [MoCA], Mini-Mental State Examination), and medication (levodopa equivalent daily dose [LEDD]) data were compared between baseline and 10 years postoperatively. RESULTS: During a mean follow-up of 4.8 ± 3.5 years, 42 deaths (6.9%) occurred, yielding an age-adjusted mortality rate of 3.3 per 100,000 person-years. The estimated 5- and 10-year survival rates were 95% and 77%, respectively. The most frequent cause of death was aspiration pneumonia (11.9%). In multivariate Cox analysis, lower preoperative MoCA scores (hazard ratio [HR] = 0.83, 95% CI 0.73-0.95, p < 0.01) and higher OFF state MDS-UPDRS Part III scores (HR = 1.03, 95% CI 1.00-1.07, p < 0.05) independently predicted mortality, whereas age at surgery was not significantly associated with survival. Among 118 patients with 10-year follow-up, OFF state motor and cognitive scores worsened significantly (p < 0.01), while ON state motor scores (p = 0.21) and total LEDD (p = 0.06) remained stable, suggesting sustained motor control and medication-sparing effects. CONCLUSION: Long-term survival after STN-DBS in PD was favorable. Preoperative cognitive and motor status, rather than age, determined long-term prognosis, emphasizing the enduring therapeutic value of STN-DBS.