Parkinson's does shortens one's life, though, and as he was already showing noticeable signs (no doubt exacerbated by the stress of a losing war) of it in his 50s, I would doubt his life span would extend into the 80s or 90s. Possible, but not probable.

Kai, neurosurgery is your forte, would you care to weigh in on this?

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Best Regards,
JW