A 71-year-old retired professor presents with his daughter, who has noticed increasing forgetfulness over the past year. He repeats questions during conversations, misplaces items frequently, and occasionally forgets appointments. Neuropsychological testing reveals performance 1.5 standard deviations below age-matched norms in the memory domain, with other cognitive domains intact. He continues to manage his finances, drive safely, and live independently. He scores 24/30 on the MoCA. Basic metabolic panel, TSH, vitamin B12, folate, RPR, and CBC are within normal limits.