Answer:
Vascular dementia
Explanation:
Vascular dementia is a type of brain damage. This is as a result of multiple strokes this ailment brings about a loss of memory in Old person's especially people who are more likely to have stroke caused by obesity or by diabetes.
The symptoms involves cognitive difficulty, that is having issues with reasoning and also in making judgements. The person's memory gets affected in later stages of this ailment. We can see the symptoms present in Stephen. he finds it difficult to recall, communicate or do things.