Forgetting names is normal. Forgetting lives is not. Most of what worries people in their seventies is the brain doing what brains do as they age.
Dr. Steven Resnick, a board-certified neurologist, walks through what is normal cognitive aging, what is a red flag, the differential when something is off, the reversible causes worth ruling out, and what protects the aging brain.
The aging brain is not the failing brain. With age, the prefrontal cortex undergoes mild volume change, the hippocampus undergoes subtle change, the white matter accumulates small changes, and the brain shows slight sulcal widening. These are real but normal. The brain still works, just differently.
We cover the six domains of normal cognitive aging: slower word retrieval, names taking longer, multitasking getting harder, new learning being slower, processing speed slowing, and working memory contracting. If your experience lives in these six, you are probably looking at normal aging.
We then cover the patterns that warrant a conversation with a physician: getting lost in familiar places, repeating questions within minutes, personality or mood change, trouble with familiar tasks like finances or driving, word substitution that doesn’t make sense, and family noticing changes you have not.
We walk through the differential beyond aging (subjective cognitive decline, mild cognitive impairment, the dementias including Alzheimer’s, vascular, frontotemporal, Lewy body, mixed, and reversible causes), and the reversible causes worth ruling out: B12 deficiency, thyroid disease, depression, sleep apnea, medication effects, alcohol, vitamin D deficiency, and untreated hearing loss.
Dr. Resnick spends a slide on the hearing connection: untreated hearing loss is one of the largest modifiable risk factors for dementia in the published evidence. The mechanism, the fix, and why now and not later.
We cover what protects the aging brain. Cognitive engagement, social connection, aerobic exercise, sleep, cardiovascular risk factor management (blood pressure, glucose, lipids), and stress regulation. Both lifestyle and medication, when matched. Dr. Resnick is direct: this is how he practices. Both. Always.
We close with Howard (composite, 72) who came in convinced he had Alzheimer’s. The workup found normal cognitive aging plus three modifiable factors: untreated hypertension, high-frequency hearing loss, iron deficiency. Six months later: factors corrected, memory subjectively unchanged, anxiety dropped to zero. The brain was aging. It was not failing.
A note on this content. The Healthy Mind is a place for medical education, not medical advice. Watching this channel does not create a doctor-patient relationship. If something in this video resonates with you, that recognition is meaningful. The next step is a conversation with your own physician, who knows your full clinical history and can address your specific situation. No video can substitute for the care of someone who has examined you. Patient examples shared on this channel are composites or representative clinical patterns; identifying details have been changed. If you are experiencing a medical emergency, call 911 or your local emergency services immediately. Dr. Steven Resnick
CHAPTERS
0:00 Forgetting names is normal. Forgetting lives is not
0:45 Howard: 72, convinced he had Alzheimer’s
3:00 What’s actually changing in the aging brain
4:30 What’s normal cognitive aging
6:15 What’s a red flag
8:00 The differential beyond aging
9:30 The reversible causes worth ruling out
11:15 What protects the aging brain
13:00 The hearing connection
14:30 When to come in
15:30 Howard’s path
16:45 Close
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