I just want to emphasize your exception. Old tradespeople are the best! I have had nothing but good experiences with them. Young hotheads are everywhere in the trades and they can be so bad you have to call the police on them. Old guys who have survived for many years tend to be extremely knowledgeable and efficient in their work.
Related: Treat them better than you would a normal contractor. Because, honestly, they are probably doing you a favor. Which is to say, they could make more money doing another job with their skills, but are choosing to do yours.