So apparently it is genetic, the lack of the APOE E4 gene/allele is why Mexicans can recover from brain trauma, not get CTE, low rate of Alzheimer's, etc. Lowest carriers of that variant among all groups of people. Some groups in Asia have lower rate, some higher but Mexicans overall clearly have the lowest frequency of it on average.
I mentioned it before, but Julio Cesar Chavez Sr. is insanely quick and witty for his age. I don't understand Spanish, but you could tell his verbal fluency isn't slow. People in the comments are saying the same thing.
But even people like Robert Garcia and his brother, you watch them in interviews and they basically are still sharp with their words and vocabulary.
