Keep in mind he said it on the cuff after someone asked him a question. Sure it was not a good answer and most disagree with it. But don’t over react to it. McCain is not exactly what we wanted but he is better than the alternative.
If he really believed that, McCain would not be posting all of these increasingly effective ads.
I couldn’t imagine what it would be like making 1 - sometimes 2 campaign stops a day, the traveling, the noise, the speeches, saying the same thing, yet trying hard to be fresh each time. I couldn’t imagine doing that at 72.