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How to Improve Your Memory & Cognitive Function at Any Age | Dr. Alan Castel

Andrew HubermanAndrew Huberman
Science & Technology5 min read149 min video
Jul 13, 2026|10,353 views|651|44
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TL;DR

Improving memory isn't about rote learning but often involves making mistakes and intentional effort, while a positive mindset about aging can actually extend lifespan and cognitive function, challenging the notion of inevitable decline.

Key Insights

1

Learning through errors is highly effective; for instance, trying to draw the Apple logo from memory, even incorrectly, leads to better retention than just seeing it repeatedly.

2

Physical exercise, specifically walking 3-4 times a week for 40 minutes, has been shown to increase hippocampal volume by 1% in older adults and improve memory, counteracting the typical 1-2% annual decline in this brain region after age 50.

3

People over 40 tend to feel approximately 20% younger than their chronological age, and this 'subjective age' is a better predictor of longevity than biological age.

4

As people age, their 'state curiosity' (curiosity about specific information) tends to increase, leading to better memory for things they care about, while their ability to forget irrelevant information also improves.

5

Social connections are crucial for successful aging; research suggests spending 5 hours a week with grandchildren can improve memory in older adults, though more than 20 hours may have the opposite effect due to stress.

6

The 'ABC's of successful aging' include a positive 'Attitude,' the ability to 'Adapt' to physical and mental changes, maintaining 'Balance' (both physical and mental), and fostering 'Connection' with others.

Embracing errors as a powerful learning tool

Counter-intuitively, making mistakes is one of the most effective ways to learn and consolidate memories. Dr. Alan Castel highlights that merely observing something repeatedly, like the ubiquitous Apple logo, does not guarantee memory retention. He demonstrates this in his classes by asking students to draw the logo from memory – a task that often reveals surprising gaps in recollection, such as the bite's location or the presence of a stem. The struggle and 'errorful trial' associated with this task paradoxically enhance subsequent learning and memory. This 'desirable difficulty' principle suggests that discomfort in learning can be highly beneficial, forcing deeper engagement with information rather than passive reception. This mechanism extends beyond academic settings, applicable to everyday observations like the location of a fire extinguisher, where actively searching for it imprints its position far better than simply being told.

Memory is reconstructive and influenced by beliefs

Memory is not a perfect recording device but rather a reconstructive process, often influenced by our current state, emotions, and even our imagination of the future. This inherent reconstructive nature explains why two people can remember the same event differently or why 'false memories' can occur. A surprising finding is that our beliefs about aging significantly impact actual cognitive decline, with positive attitudes correlating with better outcomes. This suggests a powerful psychological component to maintaining cognitive function, emphasizing that aging's impact on memory is far more nuanced and optimistic than commonly assumed.

Physical exercise directly impacts brain volume and memory

A groundbreaking study demonstrated that physical exercise directly impacts brain structure and memory function in older adults. Participants who were randomly assigned to walk 3-4 times a week for 40 minutes experienced a 1% increase in hippocampal volume over a year. This is significant because the hippocampus, a brain region crucial for declarative memory, typically shrinks by 1-2% annually due to aging. Furthermore, the walking group showed measurable improvements in memory performance. This 'non-pharmacological intervention' highlights that accessible activities like brisk walking can effectively counteract age-related brain shrinkage and cognitive decline, offering a tangible strategy for maintaining brain health.

Subjective age as a predictor of longevity

Interestingly, how old one 'feels' internally, known as subjective age, is a more accurate predictor of lifespan than chronological age. After age 40, most individuals tend to feel approximately 20% younger than their actual age. This psychological factor underscores the importance of a positive self-perception regarding aging. Individuals who feel younger often engage in more active and healthy behaviors, influencing their physical and mental well-being. This finding suggests that a shift in attitude towards aging, viewing it as an opportunity for continued growth and vitality rather than inevitable decline, can have profound effects on actual life outcomes.

The importance of active learning and selective forgetting

Active engagement with information, such as physically tracing a fire escape route in a new hotel, is far more effective for short-term and 'medium-term' memory than passive observation. This 'everyday memory' is crucial for survival and daily functioning. Dr. Castel also highlights the benefits of 'selective forgetting,' where our brains efficiently discard irrelevant or outdated information, like a hotel room number after checking out. This process prevents cognitive overload and allows for updated learning, demonstrating that forgetting can be a healthy and adaptive function rather than solely a deficit.

Curiosity and a sense of purpose drive learning and resilience

Curiosity is a powerful motivator for learning across the lifespan, particularly for older adults. While 'trait curiosity' (general inquisitiveness) may decline with age, 'state curiosity' (interest in specific, novel information) often increases. This allows older adults to focus their cognitive resources on topics they genuinely care about, leading to effective learning and better retention of that specific information, while simultaneously disengaging from things they deem irrelevant. This selective focus, coupled with a strong sense of purpose, contributes to the remarkable resilience observed in many older adults, enabling them to navigate life's challenges with greater equanimity and maintain high levels of life satisfaction.

The 'ABC's of successful aging': attitude, balance, and connection

Dr. Castel distills the principles of thriving with age into the 'ABC's of successful aging.' 'Attitude' refers to maintaining a positive outlook; research indicates that a positive attitude about aging is linked to living longer and reduced dementia risk. 'Balance' encompasses both physical equilibrium (preventing falls, which affect 1 in 4 people over 65) and mental equilibrium, avoiding extremes in lifestyle. Finally, 'Connection' emphasizes the critical role of social relationships. Strong social ties, such as spending about 5 hours a week with grandchildren, correlate with improved memory and overall well-being. These non-extreme, integrated approaches to daily life, rather than isolated 'biohacking' efforts, contribute significantly to successful and fulfilling aging experiences.

Common Questions

Memory is a mental representation of the past that is inherently reconstructive and not always accurate. It starts at a sensory level, is influenced by our awareness of our own cognition (metacognition), and can be improved through deeper semantic learning and making mistakes.

Topics

Mentioned in this video

People
Andrew Huberman

Host of the Huberman Lab podcast and professor of neurobiology and ophthalmology at Stanford School of Medicine.

Alan Castel

Professor of psychology at UCLA and expert on human memory and cognitive aging, guest on the podcast.

Dean Potter

Mentioned as a free solo climber and wing suiter, whose documentary illustrates how highly trained people can default to routines under high arousal.

Alex Honnold

Free solo climber mentioned as a successor to Dean Potter.

Helen Blau

Professor at Stanford whose lab is researching cartilage regeneration.

John Wooden

Legendary UCLA basketball coach interviewed by Dr. Castel, known for his philosophy of leadership focusing on love and balance.

Joe Parvizi

Andrew Huberman's colleague at Stanford who studies the anterior mid-cingulate cortex by probing it with electrodes in humans.

Ryan Soave

Trauma therapist and podcast guest who noted that young adults' breakups feel like a 'loss of the entire future' because they haven't experienced enough of it.

Steve Jobs

Co-founder of Apple, mentioned for his intense drive and approach to life, raising questions about unconscious knowledge of lifespan.

Walter Isaacson

Author of Steve Jobs' biography.

Sully Sullenberger

Pilot of the 'Miracle on the Hudson,' used as an example of practical wisdom accumulated through diverse experience over time.

Mahatma Gandhi

Historical figure mentioned as a source of potential wisdom in a hypothetical AI scenario.

Jane Goodall

Environmentalist mentioned as a source of potential wisdom in a hypothetical AI scenario.

Leichin Low

Andrew Huberman's colleague at Stanford and author of a 'Principles of Neurobiology' textbook.

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