https://www.publichealth.columbia.ed...ine-later-life
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The researchers found that, compared with workers never earning low wages, sustained low-wage earners experienced significantly faster memory decline in older age. They experienced approximately one excess year of cognitive aging per a 10-year period; in other words, the level of cognitive aging experienced over a 10-year period by sustained low-wage earners would be what those who never earned low wages experienced in 11 years.
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Given this study, it stands to reason that the reverse would be true as well. Higher wages lead to increased cognitive function. That's why it is so good we live under capitalism and that such a large percentage of the wealth is concentrated among such a relatively small percentage of individuals.
These people losing their cognitive function were never using their brains to begin with. They didn't need brains to do their jobs. The wages (along with brainpower), should be reserved to those who need it most and are providing jobs to the rest of us.