The brain undergoes a great “rewiring” after age 40
Published in Brain Activity, Brain/Neurology.
In the fifth decade of life, our brains start to undergo a radical “rewiring” that results in diverse networks becoming more integrated and connected over the ensuing decades, with accompanying effects on cognition. The networking changes likely result from the brain reorganizing itself to function as well as it can with dwindling resources and aging “hardware.” Proper diet, regular exercise, and a healthy lifestyle can keep the mind in good working order and put networking changes on hold, sometimes well into old age.
https://bigthink.com/neuropsych/great-brain-rewiring-after-age-40/