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What is the onset age of Parkinson's disease and how does it differ?

According to the National Institute on Aging, approximately 5% to 10% of people with Parkinson's disease experience onset before the age of 50. Answering the question, **what is the onset age of Parkinson's disease**, requires looking at different age groups, as the disease can manifest across a wide spectrum from young adulthood to late senior years, with distinct characteristics for each.