Impossible to say with so little information. If he has something like dementia yes He could be denied. He will also likely need extra cardiac testing to ensure that there are no current cardiac issues.Today my parents are done with medicals. My father got operated 28 years back and had a major surgery . Stunt was put while doing surgery.m and he has short term memory loss as well . Doctor somehow mentioned that it could be problem in approval . What do you guys suggest ? Can he be rejected on medical grounds ?