The course of Parkinson's disease generally lasts for how long? Parkinson's disease, also known as shaking palsy, is a common neurodegenerative disease, and the age at onset varies. For early-onset Parkinson's disease, it generally starts around age 40 to 50, while late-onset Parkinson's disease generally starts after age 50. As age gradually increases, the course of Parkinson's disease is generally about 20 to 40 years. Once diagnosed with Parkinson's disease, it is a lifelong condition. This disease is incurable, and can only be managed through medications, surgical treatments, physical rehabilitation, and psychological therapies to improve or control symptoms, but it cannot be cured. Therefore, once diagnosed with Parkinson's disease, the disease is lifelong.