Speaking of Omarosa

[timelets]

Environmental Influences on Cognitive and Brain Plasticity During Aging. Kramer, et. al. 2004.

https://academic.oup.com/biomedgerontology/article/59/9/M940/535383
https://doi.org/10.1093/gerona/59.9.M940

among other things:

Similarly, studies reporting change in memory measures and crystallized intelligence suggest that education has a protective effect. For instance, results from the MacArthur Studies of Successful Aging showed that low levels of education (apart from cognitive performance at baseline) was the strongest predictor of cognitive decline in measures of verbal and nonverbal memory, conceptualization, and nonverbal abilities over 2–2.5 years in a sample of 70–79 seniors (46). However, education seems to be a less powerful predictor of changes in fluid abilities and processing speed.
...

The main finding of this research was that the level of complexity of an occupation positively influences the level of intellectual functioning for both men and women. Furthermore, this relationship between occupational complexity and intellectual function increases with age. Similar effects have been reported in other studies of the relationship between occupational complexity and intellectual functioning in the United States, Poland, Japan, and the Ukraine (64–70). Schooler and Mulatu (71) reported additional evidence of a relationship between cognitively complex activities and cognitive functioning when leisure time activities are considered. Cognitively stimulating leisure activities were defined as activities such as the number of books and magazines read, numbers of hobbies and other interests, and so forth.