This is about a 26-year old, not a 65-year old, but it's also of interest: https://nautil.us/how-i-rewired-my-brain-to-become-fluent-in-math-rp-5164/ https://na

This is about a 26-year old, not a 65-year old, but it's also of interest: https://nautil.us/how-i-rewired-my-brain-to-become-fluent-in-math-rp-5164/ https://nautil.us/how-i-rewired-my-brain-to-become-fluent-in... Also, HN discussion: https://news.ycombinator.com/item?id=8402859 https://news.ycombinator.com/item?id=8402859