Covid and dementia. Is there a link ?

This article points to increased risk especially of vascular dementia. I'm sorry that you and your husband are experiencing this.
https://www.nature.com/articles/s44400-025-00034-y.

There is some evidence that covid infection might be a trigger for dementia, especially in older adults. Studies have found that people who had COVID-19 who are over 65 have an increased risk of developing new memory problems or dementia afterwards.
It's thought that the virus causes inflammation in the brain or somehow damages the central nervous system, which can speed up the process of cognitive decline, as is seen in Alzheimer's.
It could be a coincidence, but I think it is more probable that it is connected.

Here's another study published by the National Institute of Health. There appears to be a link between the two.
https://pubmed.ncbi.nlm.nih.gov/40037563/

AI makes it easy to answer some questions, but raises more:

Yearly Progression
• In 2000, estimates of U.S. Alzheimer’s cases were about 4–4.5 million people.
• By 2010, this grew to approximately 4.7 million.
• In 2015, roughly 5.1 million Americans age 65+ were affected.
• By 2020, that number rose to about 5.8 million among those age 65+.
• In 2024, about 6.9 million Americans age 65+ had been diagnosed.
• By 2025, projections and recent counts show approximately 7.1–7.2 million age 65+ living with the disease.

My wife's sister noticed some symptons 9-years ago. I'm not a doctor, but it came on slowly over he years. She would laugh at the same 'funny' commercials every time.

@bridgeback2 ; @elliottw Can you tell us what your sources are for this information? We must make sure that the only information on MCC is scientifically correct. Not saying that you are wrong, but the rules are that information always be based on science.