It is not uncommon to hear that the bilingual brain is an efficiently multitasking brain. It is potentially less common however to observe the bilingual brain as it ages. Would it’s high functioning throughout life wear it out? Or does it make it more resilient in the face of disease and disorders like dementia and Alzheimer’s?
The article below gives a brief yet rich insight into studies made regarding this very matter.
https://www.sciencedaily.com/releases/2020/02/200213132619.htm