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He may holler and shout but he looks and moves like a 100-year-old fart.
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Hollering and shouting is what 100-year-olds do best. It is reflexive.

I did art therapy for a while, long ago. Elders with strokes and other cognitive disabilities will retain whatever most occupied their thoughts when they were healthier. So, if they spent their lives filled with invective, they can lose the ability to speak clearly, but retain the ability to clearly insert expletives everywhere. If they were obsessed with depressive thoughts, they will become overwhelmed with negativity and incapable of becoming positive enough to overcome the damage.

We all need to examine our cognitive habits, because everyone is vulnerable to stroke or dementia.

Having worked in three nursing homes I concur entirely. Saw that happen all the time. Most startlingly for me , at first, were the women. Until I learned through training just what you described about ingrained and reflexive behavior. The sweetest old dear could suddenly curse a blue streak that would make the entire US Marine Corps blush.

I believe it's what called ‘’ the reptilian brain’’ or the limbic system(?). That part of the brain that is our ‘’primitive’’ as it were, part of us that has the ‘’fight or flight’’ response. The vestige of our ancient ancestors and how it served their fight into nature.

We all need to examine our cognitive habits, because everyone is vulnerable to stroke or dementia.

Cognitive habits? Lol. As we live from day to day and year to year we DO develop habits. We use our BRAINS when we do that; therefore ALL behavior is "cognitive."

Stroke and dementia usually go hand in hand.
However, Alois Alzheimer changed the world view of dementia.

Google
On November 3, 1906, a clinical psychiatrist and neuroanatomist, Alois Alzheimer, reported “A peculiar severe disease process of the cerebral cortex” to the 37th Meeting of South-West German Psychiatrists in Tubingen, He described a 50-year-old woman whom he had followed from her admission for paranoia, progressive sleep and memory disturbance, aggression, and confusion, until her death 5 years later. His report noted distinctive plaques and neurofibrillary tangles in the brain histology. It excited little interest despite an enthusiastic response from Kraepelin, who promptly included “Alzheimer's disease” in the 3ih edition of his text Psychiatrie in 1910. Alzheimer published three further cases in 1909 and a “plaque-only” variant in 1911, which reexamination of the original specimens in 1993 showed to be a different stage of the same process, Alzheimer died in 1915, aged 51, soon after gaining the chair of psychiatry in Breslau, and long before his name became a household word.

Alzheimer's disease is NOT genetic. It is, for all intents and purposes, self-inflicted. People give up, stop caring about life. Their memory, emotional control and cognitive thinking fail...all together, it seems.
And there is no cure. There are some medications but they don't do so much.