America's rates have fallen by a third in the past two decades — even though more people are living with the condition than ever before.Researchers say lower smoking rates and better education about diet and other risk factors have led to the relatively rapid decline. Some 8.5 per cent of Americans over 65 were estimated to have the memory-robbing disorder in 2016 — the latest year — compared to 12.2 per cent in 2000.
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