Not sure what the point of your expression is. He was in good health because of things completely and utterly unrelated to visiting a doctor. If he had health problems, he'd simply die without seeing a doctor, which happens all the time.
Him surviving to 75 is utterly and completely irrelevant much like gay people being visibly present has absolutely no relevance to their literal existance. Gay people exist with or without being allowed to express, and health issues exist with or without being diagnosed.