Given the word "cognitive" was used I assume "cognitive decline" refers to some sort of scientific measurement like an IQ test. If 80% of the population is exp

Given the word "cognitive" was used I assume "cognitive decline" refers to some sort of scientific measurement like an IQ test. If 80% of the population is experiencing it that would be pretty easy to measure, I would think? If we are just discussing whether human beings are awful... humans were being awful far before the popularization of coffee beans, so that seems like a red herring in general.