Alzheimer’s disease may begin its biological progression far earlier than symptoms suggest, with subtle shifts in brain and blood markers emerging decades in advance.

Scientists are uncovering a hidden phase of Alzheimer’s disease that may begin far earlier than most people realize. Long before memory loss becomes noticeable, subtle biological changes could already be underway — potentially starting in a person’s late 50s, according to new research from Mayo Clinic.

The study, published in Alzheimer’s & Dementia: The Journal of the Alzheimer’s Association, tracks when key changes in the brain and blood begin to speed up over a person’s lifetime. The findings offer clues about the most effective timing for detection and prevention efforts.

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