How to Improve Your Memory & Cognitive Function at Any Age | Dr. Alan Castel
Dr. Alan Castel discusses the science of memory, aging, and cognitive function across the lifespan, emphasizing that memory decline is not inevitable and that learning happens best through productive struggle and retrieval practice. He introduces the concept of 'super-agers'—older adults who maintain exceptional cognitive abilities—and explains that attitude, balance, and social connection are key factors in successful aging.
Summary
Dr. Alan Castel, a leading memory and cognitive aging researcher at UCLA, explores how memory actually works and challenges common misconceptions about aging. The conversation begins with fundamental principles of memory formation, emphasizing that repetition alone doesn't guarantee retention—instead, retrieval failure followed by corrective feedback produces better learning. Castel illustrates this with examples like the Apple logo test, where people struggle to recall details they've seen thousands of times, demonstrating that familiarity doesn't equal knowledge. He explains that memory is reconstructive, never purely accurate, and subject to metacognitive illusions where we overestimate what we know.
The discussion covers productive struggle as essential to learning, contrasting with intuitions that learning should be easy. Castel explains that when students engage in errorful retrieval practice—attempting to recall information before being corrected—they learn more deeply than when given information passively. This principle extends to everyday life: the best learners persist through frustration and curiosity, asking questions and seeking feedback.
A significant portion addresses the psychology of aging and challenges the narrative of inevitable cognitive decline. Castel presents evidence that many cognitive abilities remain stable or even improve with age, and that subjective age (how old you feel) is actually a better predictor of longevity than chronological age. He discusses research showing that older adults exhibit resilience during crisis (like COVID-19), likely due to accumulated life experience managing difficult situations.
Castel introduces 'super-agers'—individuals whose memory performance rivals people decades younger—and argues they are not exceptional athletes or extreme biohackers but rather people who maintain curiosity, physical activity, sleep, and social connections. He presents the ABC framework for successful aging: Attitude (maintaining agency and positive expectations), Balance (avoiding extremes in any domain), and Connection (maintaining meaningful relationships).
The conversation extensively explores the relationship between memory, emotion, and eyewitness testimony, using the Ronald Cotton case to demonstrate how memory can be contaminated through identification processes, with confidence not predicting accuracy. Castel discusses source memory decline with age and how older adults become better at selectively focusing on what matters while forgetting trivial information.
Physical factors like exercise, sleep, and balance training emerge as critical for cognitive health. Research is presented showing that cardiovascular exercise increases hippocampal volume and improves memory, while balance training prevents falls that can cascade into cognitive decline. Castel emphasizes that these interventions need not be extreme—walking three to four times weekly produces measurable benefits.
The discussion addresses technology and modern challenges, including how AI and deepfakes present novel scams targeting older adults through emotional appeals. Castel's current research examines curiosity across the lifespan, finding that while trait curiosity may decline, state curiosity (engagement when presented with interesting information) actually increases with age for topics of genuine interest.
Throughout, Castel emphasizes that successful aging involves purpose and generativity—the sense of contributing to the next generation through mentorship, grandparenting, or volunteering. He presents evidence that intergenerational interaction benefits both young and old, citing his own classroom experience where senior scholars enriched undergraduate learning about aging.
The conversation concludes with reflections on meaning-making in life, with Castel noting that younger people often catastrophize individual setbacks (like romantic breakups) as life-ending, while older adults contextualize challenges within broader life narratives. He argues that having models of successful aging—observing how parents and grandparents navigate challenges—shapes expectations and behaviors.
About this episode
Dr. Alan Castel, PhD, is a professor of psychology at the University of California, Los Angeles (UCLA) and one of the world's foremost experts on human memory and cognitive aging. We discuss what science actually tells us about how to improve our learning ability and memory at any age. We also discuss how memory works, why all planning and imagination about the future is based on the past, false memories, and how to leverage curiosity, emotion, and self-testing retrieval practice to stamp in memories for the long term. We discuss what "superagers"—people who actually improve their cognitive capacity with age—do differently than everyone else. This episode is for anyone interested in the science of memory and tools to maintain and improve your memory across the lifespan. Thank you to our sponsors AG1: https://drinkag1.com/huberman Wealthfront*: https://wealthfront.com/huberman Helix Sleep: https://helixsleep.com/huberman Function: https://functionhealth.com/huberman Lingo: https://hellolingo.com/huberman Timestamps (00:00:00) Dr. Alan Castel (00:02:41) What Is Memory?, Reconstruction & Metacognition (00:04:49) Mnemonics, Remembering Names & Deeper Learning (00:08:22) The Penny & Apple Logo, Noticing vs Seeing, Learning Through Mistakes (00:10:43) Sponsors: Wealthfront & Helix (00:14:05) Neuroplasticity, Frustration, Curiosity & Mindset (00:17:42) Maintaining vs Learning New Things, Habits, Novelty & Emotional Memory (00:24:28) "Mental Photographs," Photo-Taking & Imagining the Future (00:29:28) Eyewitness Memory, the Ronald Cotton Case, Confidence vs Accuracy (00:35:07) Medium-Term & Prospective Memory, Hotel Fire Exits (00:40:28) Sponsor: AG1 (00:41:47) When Habits Turn Lethal, Aviation & Human Error (00:49:01) Why Memory Changes With Age; Alzheimer's & the Nun Study (00:52:34) Exercise & Hippocampal Volume, Falls & Balance (00:57:14) SuperAgers & Athletes; Regret, Balance & Being Driven (01:12:08) Sponsor: Function (01:13:45) Age Stereotypes, Subjective Age & Positive Age Beliefs (01:20:02) Goals & Plans, Scams; Anterior Midcingulate Cortex & SuperAgers (01:26:23) Culture, Resilience, Blue Zones & COVID (01:29:18) Adversity, the Positivity Effect & Intergenerational Learning (01:36:31) Sponsor: Lingo (01:38:00) Limitations & Purpose; Time, Family & Connection (01:44:58) Deliberately Building Memories; the ABCs of Successful Aging (01:51:02) Following Your Interests; Castel's Path & Older Adults (01:57:16) Mental Simulations, Curiosity Studies & Selectivity (02:01:19) Socioemotional Selectivity Theory; Steve Jobs & Lifespan (02:07:10) The Secret to Successful Aging; State vs Trait Curiosity (02:11:04) Scams & AI Voice Cloning (02:14:31) John Wooden, Wisdom, Love & Balance (02:17:41) Learning Through Mistakes; Does the Brain Get Better With Age? (02:25:00) Conclusion, Better With Age (02:26:00) Zero-Cost Support, YouTube, Spotify & Apple Follow, Reviews & Feedback, Sponsors, Protocols Book, Social Media, Neural Network Newsletter Disclaimer & Disclosures *This experience may not be representative of other Wealthfront clients, and there is no guarantee of future performance or success. Experiences will vary. Andrew Huberman receives cash compensation from Wealthfront Brokerage for paid testimonials in his podcast, creating a conflict of interest. The Cash Account, which is not a deposit account, is offered by Wealthfront Brokerage LLC, member FINRA/SIPC. Wealthfront Brokerage is not a bank. The base APY is 3.30% on cash deposits as of January 30, 2026, is representative, subject to change, and requires no minimum. If eligible for the overall boosted rate of 4.05% offered in connection with this promo, your boosted rate is also subject to change if the base rate decreases during the 3 month promo period. Additional terms and conditions apply, which can be found on Wealthfront.com/Huberman. Funds in the Cash Account are swept to program banks, where it earns the variable APY. Same-day withdrawal or instant payment transfers may be limited by destination institutions, daily transaction caps, and by participating entities such as Wells Fargo, the RTP® Network, and FedNow® Service. New Cash Account deposits are subject to a 2-4 day holding period before becoming available for transfer. Investment advisory services are provided by Wealthfront Advisers LLC, an SEC-registered investment adviser. Securities investments: not bank deposits, bank-guaranteed or FDIC-insured, and may lose value. Learn more about your ad choices. Visit megaphone.fm/adchoices
Key Insights
- Castel argues that seeing something repeatedly does not guarantee memory retention; the Apple logo study shows people cannot accurately recall a logo they've seen thousands of times, indicating familiarity does not equal knowledge.
- Good learning happens through retrieval failure paired with corrective feedback, not through repeated exposure or mnemonic tricks; struggling to recall information activates deeper learning than passive repetition.
- Metacognition—awareness of one's own cognition—is often inaccurate; people overestimate what they know and don't realize their memory is reconstructive and fallible.
- Castel found that eyewitness identification contaminates memory; once someone identifies a suspect in a lineup, that identified person's features can replace the actual perpetrator's features in memory, demonstrating how confidence doesn't predict accuracy.
- Memory is not a filing system but a reconstruction influenced by emotion, current beliefs, and subsequent experiences; the more you retrieve and revisit a memory, the more you reconstruct it.
- Imagining the future and remembering the past activate similar brain regions because future imagination must be based on past experiences; this explains why memory errors resemble imaginative construction.
- Subjective age—how old you feel—is a better predictor of longevity than chronological age, and older adults who believe they have agency over aging outcomes live longer and are less likely to develop dementia.
- Curiosity increases with age in specific contexts; while general trait curiosity may decline, older adults show heightened state curiosity for information on topics they genuinely care about, which guides what they remember.
- Super-agers maintain exceptional cognitive abilities not through extreme interventions but through moderate, consistent practices including cardiovascular exercise, sleep, balance training, and social engagement.
- Walking three to four times weekly for 40 minutes can increase hippocampal volume by approximately 1% annually, counteracting the typical 1-2% annual decline in this brain region responsible for declarative memory.
- Older adults demonstrate greater resilience than younger adults during crises because they have lived through multiple previous difficult situations; they contextualize current challenges within broader life narratives.
- Castel argues that Alzheimer's pathology (plaques and tangles) doesn't always correlate with cognitive decline; some individuals with clear pathological markers remain behaviorally high-functioning, suggesting cognitive reserve or other protective factors.
- One-leg balance exercises and proprioceptive training are highly trainable and show improvements within weeks or months; most older adults overestimate their balance and don't realize they're close to falling.
- Selective optimization with compensation—focusing energy on activities that matter most while accepting decreased capacity in other areas—characterizes successful aging more than maintaining broad capabilities.
- The 'if only' thought pattern is counterproductive and potentially psychologically damaging; older adults who have experienced setbacks show better mental health by contextualizing past failures within life trajectories rather than ruminating on alternative paths.
Topics
Transcript
Good learning happens through making mistakes. Just seeing something many times doesn't mean you'll remember it well. You've seen the Apple logo so many times, of course you know all the features, but then when you quiz people and test them, and I do this in my class, people aren't sure, is the bite on the left or the right-hand side? Is there a stem or a leaf? The best way to remember something is to, again, failures. I'll have you draw it without looking at it, and you struggle, and you wait, is it on the left or right? Is it a stem or a leaf? And you're starting to question all of these things. Then when you look…
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