The 82-year-old admitted he worries about developing the condition.
The ex-Manchester United boss stepped down in 2013 after bringing 38 trophies to Old Trafford, including 13 Premier League and two Champions League titles.
He said: "My memory is quite good, praise the Lord, touch wood - I don't know if it will stay that way.
"But I worry about it, 100%. I would be lying if I felt I was anywhere different. I read a lot, I do quizzes and I think that helps."
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