Researchers have found a woman with a rare genetic mutation that has protected her from dementia even though her brain has developed major neurological features of the disease.

The woman's genetic profile showed she would develop Alzheimer's by the time she turned 50.

A member of the world's largest family to suffer from Alzheimer's, she, like generations of her relatives, was born with a gene mutation that causes people to begin having memory and thinking problems in their 40s and deteriorate rapidly toward death around age 60.

But remarkably, she experienced no cognitive decline at all until her 70s, nearly

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