Harvard Health on exercise and aging

Harvard Health looks at the benefits of exercise as we age.

44-Year Study on fitness and dementia

A science-heavy look at how fitness can stave off dementia.

Huberman Lab podcast on aging, memory and exercise

Dr. Wendy Suzuki joins Dr Huberman to discuss how exercise and mindset can help us as we age.

Exercise and the hippocampus

More deep science on how exercise can bolster the hippocampus and thus help deter dementia and Alzheimer's.

Google list

Good starting point so you can do your own reading.