This one's kind of personal for me. My father had the same condition, diagnosed at 33. Before Michael J Fox's charity was a reality, Mr. Ali brought the disease and the fight against it to a public arena in a way that hadn't really been seen before. Parkinson's was an "accepted" disease of old age to a lot of people, but then along comes a man who was in excellent physical condition and far too young for the condition. So young, that like my dad, doctors at first refused to call it was it was, labeling it "Parkinson's syndrome" and attributing it to boxing brain damage.
Ali could have become a hermit. He could have shrunk from publicity and public appearance, as so many people are uncomfortable with disease, but he didn't. He continued to show up. He continued to speak. He continued to live. He defied the expectation of a disease that rewires the brain and the body, and I would imagine that he did it while being handed some similar forecasts for survival to the ones my dad got: every 6 months, for 22 years, he was told he had 6 months to live.
The man was a fighter and a showman, and in the end, the latter made him a fighter of a different kind because he brought awareness to something that most people never had to see or deal with.
Godspeed, sir. RIP.