Quotes from other sources (NYT):

“There’s a direct connection between hearing and preserving cognitive function.” (I have been wearing hearing aids for 5 years. They keep me in touch with my surroundings.)

“Alzheimer’s disease is not an inevitable result of aging.”

“participants experienced no decline in major cognitive measures, except for a slight loss in memory function.”

“a variety of lifestyle factors may contribute to resilience”

“better quality education; choosing occupations that deal with complex facts and data; consuming a Mediterranean-style diet; engaging in leisure activities; socializing with other people; and exercising regularly.”

And finally ““Poor vision makes cognitive impairment worse,”