Pd is not necessarily a disase of older people and is frequently misdiagnosed in people younger than 50.
Some of the early signs of pd are tremors on one side of the body, illegible, tiny handwritting, extreme fatigue, poor concentration, poor dexteritity, slow movement, poor balance, poor short term memory, and festation (short, choppy steps when walking.)
Each of us is unique and may have different symptoms.
Bruce
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Symptoms/Age 
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