Cooper told the prince that, as a contractor, he visited 15 to 20 farms a day and liked to try to boost morale wherever he went.
William said: “Laughing is so important – a sense of humour – for getting through life.”
While William said mental health issues in the UK look to be “generational”, he was positive about the future.
“With a lot of the work and the research we’ve done, it will take a generation to fix this, but I do think we’re headed the right way, and I’m excited by that journey and that progress,” he said.