Doug Whitney, left, looks at his son, Brian, in Manson, Wash., on Nov. 5, 2022. Doug inherited the same gene mutation that gave Alzheimer's disease to his mother, brother and generations of other relatives by the unusually young age of 50. Doug is a healthy 73, his mind still sharp. Somehow, he escaped his genetic fate. Brian, who also inherited the devastating family gene, has reached the fateful age of 50 without symptoms but knows that’s no guarantee. (AP Photo/Shelby Lum)
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