Several large-scale studies have examined traits and lifestyle factors associated with people who develop Alzheimer's disease and other forms of senility, and people who maintain good cognitive abilities into old age. These studies generally conclude that

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Several large-scale studies suggest that physical and mental activity may help to protect against memory loss and cognitive decline in old age. While biological factors do play a role in memory loss, lifestyle factors such as staying socially engaged and participating in intellectually stimulating activities have been associated with better cognitive health in old age. Living a solitary and isolated life, on the other hand, may increase the risk of cognitive decline. Rates of dementia and Alzheimer's disease are not necessarily predetermined by biology alone, but may be influenced by lifestyle factors as well.

Several Large-Scale Studies Have Examined Traits and Lifestyle Factors Associated