His Royal Highness Prince Charles will celebrate his 70th birthday this November.
In honour of this event, BBC One has made a 60-minute documentary which follows the Prince over the past 12 months.
The film-maker, John Bridget, was given exclusive access to members of the Royal family, including Prince Charles and his two sons, Princes William and Harry.
During the documentary, the recently married Prince Harry makes a rather shocking revelation about his father.
Much of the documentary focuses on Charles working life, and it reveals how much work he does.
He works a seven-a-day week, and it would seem as though Charles’ busy schedule has taken its toll on his sons.
Harry explains: “He works seven days a week.
“He does need to slow down, this is a man who has dinner ridiculously late at night.
“The man never stops. I mean when we were kids there were bags and bags and bags of work that was what the office just sent to him.
“We could barely even get to his desk to say goodnight to him,” he finishes.
Furthermore, his brother William discusses how he would like his father to spend more time with his grandchildren.
William and Kate have three children together: George, Charlotte and Louis.
“It’s something I’m working on. I’d like him to be around a bit more,” Williams says when asked whether Charles has enough time to be a grandfather.
“We need him there as much as possible,” William finishes.
The Duchess of Cornwall adds: “He’s pretty impatient, he wants things done by yesterday as I think everybody who works for him will tell you.”
“That’s how he gets things done. He’s driven by this… this passion inside him to really help.
“He wants to… really wants to save… He would like to save the world,” she finishes.
Prince Charles has always been very vocal about our need to tackle climate change, and much of his life’s work has been based around saving the planet.
His Royal Highness also set up the Prince’s Trust to help young people find their vocation.
Prince Charles at 70 airs tonight on BBC One at 9pm.