Hi Rick,
This confirms my thoughts on the subject of aging. For some years now I have remarked to my wife that when you study the movements of an elderly person, they are identical to a person with advanced PD. They take short steps, very slowly, terrified in case they fall, make a grab for anything they can hold on to. Freeze if they come face to face with a person or obstacle. I remember saying I would love to give one of my elderly non PD friends a Sinemet, and obseve the effect. I feel convinced they would show an improvemet.
It surely is worth a clinical trial and maybe the quality of life could be improved for the aged.
Ron