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A Washington man appeared to be destined to develop Alzheimer’s disease — but against all genetic odds, he has eluded the common dementia for decades.

Researchers at the Washington University School of Medicine in St. Louis recently published a study focusing on Doug Whitney, 76, who lives near Seattle.

He has a rare inherited genetic mutation in the presenilin 2 (PSEN2) gene, which virtually guarantees early-onset Alzheimer’s.

STUDY REVEALS WHY ‘SUPER AGERS’ MAINTAIN ‘OUTSTANDING MEMORY’ INTO THEIR 80S

All of Whitney’s family members who inherited the gene have experienced cognitive decline starting in their early 50s or sooner, according to a WashU press release.

Whitney, however, shows no signs of mental decline. W

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