Overview of How to Improve Your Memory & Cognitive Function at Any Age | Dr. Alan Castel
This episode of Huberman Lab features psychologist Dr. Alan Castel discussing how memory works, why we forget, and what actually helps preserve cognitive function as we age. A major theme is that memory is reconstructive, selective, and trainable—not a perfect recording device. The conversation covers practical strategies for better learning at any age, why “desirable difficulties” improve retention, how aging affects memory in nuanced ways, and why factors like exercise, balance, curiosity, attitude, and social connection may be as important as traditional memory drills.
Core Ideas About Memory
Memory is not a recording
- Memory is best understood as a mental reconstruction of the past, not a flawless archive.
- Two people can witness the same event and remember it differently because memory is shaped by:
- attention
- emotion
- prior knowledge
- later information
- confidence, which often does not match accuracy
Metacognition matters
- Dr. Castel emphasizes metacognition: awareness of what we know, what we don’t know, and how well we’re learning.
- A key skill is noticing the gap between:
- current performance
- desired performance
- That gap is where learning and plasticity happen.
How to Learn and Remember Better
Mistakes improve learning
- One of the episode’s biggest takeaways is that retrieval failure plus feedback can strengthen memory.
- If you try to recall something and struggle, you often remember it better the next time.
- This is the logic behind desirable difficulties: learning should be challenging enough to require effort.
Seeing something repeatedly is not enough
- Familiarity does not guarantee detailed memory.
- Examples discussed:
- the Apple logo
- a penny
- People often think they know the details, but when tested, they miss obvious features.
Better learning strategies
- Retrieval practice: actively trying to remember
- Testing yourself instead of just rereading
- Drawing from memory
- Getting corrective feedback
- Level of processing: focusing on meaning, function, and relationships rather than labels alone
Mnemonics are useful, but limited
- Mnemonics can help for arbitrary information like names or lists.
- But they can become a workaround rather than true understanding.
- For deeper retention, Castel recommends building semantic meaning and connecting new information to existing knowledge.
Memory, Emotion, and Accuracy
Emotion strengthens memory, but can distort it
- Many memories carry emotional tags.
- Emotional events are often more vivid, but not always more accurate.
- The amygdala and other emotion-related systems influence what is stored and how strongly.
Eyewitness memory is vulnerable
- The conversation highlights how confidence can be misleading in legal settings.
- Once someone identifies a face in a lineup, that face can begin to replace the original memory.
- This helps explain wrongful convictions and why memory should be treated as one source of evidence, not a perfect record.
Aging, Memory, and Cognitive Function
Memory decline is real, but not uniform
- Aging does affect memory, but not all memory systems decline equally.
- Some abilities remain stable or may even improve:
- vocabulary
- accumulated knowledge
- selective focus on what matters
Selective forgetting can be healthy
- Forgetting is not always a problem.
- Older adults often become better at remembering what matters and dropping what doesn’t.
- This can improve efficiency and reduce cognitive clutter.
Curiosity changes with age
- Castel’s lab studies state curiosity and trait curiosity.
- While trait curiosity may decline, state curiosity—curiosity about something specific—can actually increase with age when the topic matters.
- Older adults tend to remember what they care about and forget what they don’t.
Super-Agers and Healthy Cognitive Aging
What are super-agers?
- Super-agers are older adults whose memory performance rivals much younger people.
- They are not necessarily extreme biohackers or marathon runners.
- More often, they have:
- strong routines
- purpose
- resilience
- social ties
- regular movement
- a positive attitude toward aging
Attitude toward aging matters
- One of the most surprising points: beliefs about aging themselves influence health outcomes.
- A more positive attitude about aging is linked to:
- better cognitive outcomes
- lower dementia risk
- longer life
- Castel frames this with his “ABCs” of successful aging:
- Attitude
- Balance
- Connection
Physical Exercise, Balance, and Brain Health
Exercise helps memory
- Walking, dancing, biking, swimming, and similar activities support brain health.
- The discussion cites research showing:
- walking several times per week can improve hippocampal function
- the hippocampus may even increase in volume with consistent walking
Balance is a major overlooked marker
- Balance is trainable and highly relevant to healthy aging.
- Simple tests and practices:
- standing on one leg
- yoga
- Tai Chi
- Balance loss can lead to falls, which can seriously reduce mobility and cognitive health.
Movement supports cognition
- Regular movement likely helps through multiple pathways:
- better oxygen delivery
- better sleep
- improved mood
- more daily engagement with the world
Social Connection, Purpose, and Aging Well
Connection is protective
- Social relationships become more selective with age, but often more meaningful.
- Quality matters more than quantity.
- Having mentors, family rituals, and close relationships supports mental health and memory.
Purpose drives resilience
- A strong sense of purpose helps people age well.
- Many older adults become more interested in:
- mentoring
- teaching
- spending time with grandchildren
- hobbies that feel meaningful
Balance between striving and acceptance
- The episode repeatedly returns to the idea that growth requires both:
- pushing oneself
- knowing when to let go
- Extreme effort all the time is not ideal; neither is passivity.
Practical Takeaways
For better memory and learning
- Test yourself regularly
- Expect and embrace mistakes during learning
- Use corrective feedback
- Learn by doing, not just by reading or watching
- Focus on meaning and relationships, not just labels
For healthy cognitive aging
- Walk or move regularly
- Train your balance
- Stay curious about things that matter to you
- Build routines that support sleep
- Maintain strong social ties
- Keep a positive view of aging
- Make time for purpose, not just productivity
For everyday safety and cognition
- Rehearse important procedures in advance:
- hotel exits
- emergency exits on planes
- where essentials are located
- Use active learning instead of passive awareness
Notable Insights
“Seeing” is not the same as “noticing”
- Much of learning depends on attention and active engagement.
- We stop noticing familiar things until we need them.
Younger and older minds may optimize differently
- Younger people often maximize breadth.
- Older adults often maximize selectivity and meaning.
- Aging may not simply mean “less”; it can mean more focused.
Wisdom and memory are linked
- Knowledge becomes wisdom when it is applied appropriately.
- Older adults often have an advantage in judgment, perspective, and emotional regulation.
Bottom Line
This conversation offers a hopeful view of aging: memory decline is not inevitable, uniform, or hopeless. The most important tools for preserving cognitive function are surprisingly accessible—challenge yourself, move regularly, train balance, stay curious, and invest in people and purpose. The episode’s central message is that aging well is less about chasing perfection and more about building a life with enough friction, connection, and meaning to keep the brain engaged.