If I recall right, deafness exacerbates risk for Alzheimer's and dementia because it creates social isolation. There is a relationship between social isolation and Alzheimer's.Hearing loss exacerbates the symptoms of Alzheimer's and dementia. Therefore it is very important to take care of your hearing loss. Don't risk becoming socially isolated due to not wanting to wear hearing aids. My aunt was in her late 60's and was unable to hear properly. But she didn't pay attention towards this which lead to dementia. Later she was treated with hearing aids but was shifted to dementia care Morris NJ to enjoy in the proper and healthy environment.
This risk is reduced in people who have structured their lives around high quality social interaction and communication in tandem with their deafness.
So protecting hearing is one thing, but focusing on your social interaction is crucial.