Your mother is way too old to have Alzheimer’s.
Alzheimer’s is a disease that hits people in their 40s and 50s. Senile dementia happens to the elderly, and can be from numerous causes, like nutritional deficiencies or improper diet.
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That's most certainly NOT true, although she is too old to have what would be considered the early-onset form of the disease! Most Alz is not definitively diagnosed until autopsy if at all, and the condition is generally characterized as dementia without a cause specified.
She had symptoms of memory loss somewhere around 74.