Now he is hoping to be the oldest man ever elected to a first term as president. Even if the melanoma returns, he would not be the first sitting president to have had cancer. NYTRonald Reagan was an old hag when he was elected president. After the last term of his presidency, Ronald Reagan's family acknowledged that he had Alzheimer's Disease, which may well have contributed to the way he bobbed and shook his head at press conferences during his presidencies.
With advances in human life spans, it would be wrong to count McCain out simply because he's an old horse. Reagan was an old hag and nonetheless was elected and dominated America during his presidencies.