For those who don't know, PD often has associated cognitive effects. I now search for the right word, and lose my train of thought frequently. Nonetheless I think my programming skills are so far not obviously affected, though I go through periods where it is more difficult than it used to be to concentrate and keep everything in my head necessary to finish a task in a reasonable time period.
I'm lucky in that I do not have a noticeable resting tremor that would be a dead giveaway. Also remote interviews don't involve people noticing my awkward posture or difficulty getting out of a chair. I believe so far I "pass" as far as seeming obviously disabled, although my age is apparent both visually and if you examine my resume carefully.
I would love to join a support group of people struggling with these sorts of problems. As we all know on this forum, the tech world fetishizes youth and 'potential', and tends to undervalue experience and hard-won deep knowledge.
I suggest you open the idea to basically anyone in high tech who is experiencing significant challenges due to disease or even just advancing age. Maybe a discourse channel? Or some other format. I'm sure some of us would be willing to allocate a few hours a week to set up and manage a forum. It would be great to share stories, tips & tricks, health advice and so on, knowing that it would be shared with others who are facing similar struggles.