The thing is: he wasn't an old man back then considering he's talking about his old cases with fullbands which would make him 50 years older than when the cases were happening (or maybe I'm wrong and they're not his?). They didn't have nice self-ligating braces or soft wires, etc. They were limited to medieval torture methods in comparison to modern day tech.
He's currently 95, and I suspect they are his old cases and case notes, judging from when they were.
It's true he isn't the easiest person to understand, even to a native speaker, but how many of us could speak clearly and master technology aged 95?!
