Then aged in his 70s , he had displayed signs of dementia since his 30s , and was eventually diagnosed with Alzheimer 's disease .
According to his wife , Ophelia , McPhail discovered in the 1990s that the left hemisphere of his brain was damaged .
Then aged in McPhail 's 70s , McPhail had displayed signs of dementia since his 30s , and was eventually diagnosed with Alzheimer 's disease .
According to his wife , Ophelia , McPhail discovered in the 1990s that the left hemisphere of his brain was damaged .