How to Improve Your Memory & Cognitive Function at Any Age | Dr. Alan Castel — Key Takeaways
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How to Improve Your Memory & Cognitive Function at Any Age | Dr. Alan Castel
Andrew Huberman2h 29mJul 13, 2026
Watch the originalWalking 3–4 times per week for 40 minutes increases hippocampal volume by ~1% and measurably improves memory, directly countering the typical 1–2% annual shrinkage that begins around age 50.
Key takeaways
Walking 3-4x/week for 40 min grew hippocampal volume 1% vs. 1-2% annual shrinkage
Walking 3-4x/week for 40 min grew hippocampal volume 1% vs. 1-2% annual shrinkage
- RCT: walking group vs. stretching group over 1 year; walkers gained 1% hippocampal volume while controls continued shrinking.
- Memory performance was significantly better in the walking group at 1-year follow-up.
Errorful retrieval before re-studying encodes information more deeply than passive review
Errorful retrieval before re-studying encodes information more deeply than passive review
- Attempting recall before seeing correct answer (even failing) produces stronger memory than repeated passive exposure — demonstrated with Apple logo recognition test.
- Mechanism: retrieval failure triggers deeper encoding when corrective feedback follows; applies to any learning domain.
One in four adults over 65 will fall; balance declines silently before any fall occurs
One in four adults over 65 will fall; balance declines silently before any fall occurs
- Simple test: standing on one leg eyes-open for 10 sec is baseline; eyes-closed causes tipping even in younger adults, revealing hidden deficit.
- Falls trigger immobility → reduced walking → hippocampal shrinkage, creating a compounding cognitive decline cascade.
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In this video
- 1mIntroduction: What is Memory and How Does It Work?
- 15mMnemonics, Deep Learning, and Errorful Retrieval
- 35mVisual Memory, Emotional Tagging, and Memory Reconstruction
- 55mEyewitness Memory, Confabulation, and the Fallibility of Confidence
- 1h 10mEveryday Memory, Forgetting, and Habit-Based Failures
- 1h 25mMemory, Aging, and the Role of Physical Exercise
- 1h 40mBalance, Falls, and Overlooked Risks of Aging
- 1h 50mHappiness, Midlife, and the Nonlinear Arc of Well-Being
- 2h 5mSuperagers, Successful Aging, and the ABCs Framework
- 2h 15mCuriosity, Scams, Wisdom, and Current Research
- 2h 25mClosing Reflections and Outro
“Subjective age is a better predictor of how long you'll live than your biological age.”
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