Hello and welcome to the forum. Thanks for your question and we're sorry to hear about your father. How long ago did this occur? Unfortunately, an ischemic stroke in older adults can lead to cognitive decline, dementia and walking problems. For each person suffering this type of stroke, the situation can be unique and is on a spectrum from mild to severe. https://www.medicalnewstoday.com/articles/327112 I would speak to his neurologist about this. Is his blood pressure well controlled?