Which factors most influence whether a person will develop Alzheimer's disease?

the person's environment and social interaction
the person's genetics and age
the person's gender and salt intake
the person's salt intake and stress level

The factors that most influence whether a person will develop Alzheimer's disease are the person's genetics and age. Other factors such as environmental influences, social interaction, gender, salt intake, and stress level may play a role in the development of the disease, but genetics and age are considered the primary risk factors.