Suggest Remedy For Short Term Memory Loss In A 70 Yr Old Man

Hi. I am worried about my father who will be 70 years old this month. He seems to be suffering from short term memory loss but remembers when you remind him. Obviously this is very frustrating for him and my Mother. He also seems to get short tempers whether from the memory loss I am not sure but takes it out on my Mom. My father did have a MRI scan last year but all seemed to be fine. He does have high cholesterol which is controlled by tablets. He is a born worrier and stresses easily which is the cause. Surely there is something we can do for him. Your assistance would be greatly appreciated. Thanks. Ashleigh