Beginning around the time of her 70th birthday, margaret began to experience increasing problems in learning new things, with her memory, and with her motor coordination. she now is frequently confused, sometimes doesn't recognize people she has known for a long time, and her speech as become less fluent. the condition that would most likely be diagnosed in margaret's case would be

Alzheimer's

Explanation:

Margaret's condition starts with tiny things and worsens over time, a key symptom. Also, her memory is going away and her motor coordination skills are lacking, which means she's forgetting how to do simple things. You mention that it happens around her 70th birthday, and Alzheimer's most often starts in old age.

*If you need more info, you can see the BrainPOP video on Alzheimer's.

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