Participants with GBA PD were younger at motor symptoms onset (mean [SD] age, 57.5 [10.2] years) than those with LRRK2 PD (mean [SD] age, 60.1 [9.6] years), LRRK2/GBA PD (mean [SD] age, 59.6 [9.9]), or idiopathic PD (mean [SD] age, 61.1 [10.0] years). The gene discussed is LRRK2; the disease is Parkinson disease.