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YOPD is an acronym for Young Onset Parkinsons Disease. So a YOPDer is someone whose first diagnosis (or maybe symptoms) occured before they were 60 years old. There is also Juvenile Onset PD (under 20 years of age). I hope this is helpful. Terry Terrence P. Brennan, MPH Research Laboratory Coordinator ACTG Operations Center Social & Scientific Systems, Inc. 6101 Executive Boulevard, Suite 200 Rockville, MD 20852-3907 [log in to unmask]