As part of the United States Census, data is also collected on the number of persons in each household.The census data for four decades is summarized below. 
Definitions:
Alzheimer's Disease
A progressive neurodegenerative disorder characterized by memory loss, cognitive decline, and behavioral changes, being the most common cause of dementia.
Memory
The cognitive function that allows an individual to store, retain, and recall information from past experiences.
Cognitive Functioning
Mental processes that include thinking, learning, memory, problem-solving, and decision-making.
Age
A measurement of the length of time that an individual has been alive, typically specified in years.
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