Is it possible to delay dementia as well?

My mother, who is in her 80s, has been hospitalized frequently since last year due to various inflammations. Tests also revealed that she has early-stage cerebral infarction. Perhaps because of this, her finger strength has weakened, causing her to drop things repeatedly, and she also sustained injuries on the top of her foot.

When the inflammation was severe, she experienced delirium and sepsis, so she was also admitted to the intensive care unit. Maybe that's why her mental state was relatively clear.

You have been showing slight signs of dementia since some time ago.

Recently, her memory has been declining, especially with numbers. She struggles with simple arithmetic, counting money, and reading clocks with numbers.

Can dementia that has already started be treated or delayed with medication? I feel even more sorry because the person, who was once very sharp, is now becoming forgetful. After overcoming a difficult phase, he has been diligently working on mobility rehabilitation and making efforts these days... You are worried because you are not good with numbers...

I am writing this out of frustration.