I do not know what average progression is.How well are most people after 3 years,6 years,9 years etc. As P.D does seem to be a syndrome it is difficult to get an answer.My husband has had a tremor in his right(parkinsons side) foot when excited or annoyed for over 25 years.Was this Parkinson's?How do we judge his progression rate,how do we judge each one of us?Is there a norm against which we can judge ourselves?