Old people illnesses? David couldn't say he had any experience with those. But he didn't really know anyone who had lived long enough to reach what was considered 'old age' - didn't know anyone who had one of those 'old people illnesses', other than the fact that they seemed generally frail.
He was certainly no stranger to those who used intimidation, rudeness, bullying tactics to get their ways. People thought they were more entitled the louder they raised their voices. Things shouldn't work that way, should they?
"He's not a demon. They can look like people but they'd never tell you they were a demon. He's probably just another one of those crazy religious people."