The 69-year-old royal is now a grandfather to Prince William and Kate Middleton's three children, and is preparing for his youngest son, Prince Harry, to welcome his first child with new wife, Meghan Markle, in the new year.
"But the idea somehow that I'm going to go on in exactly the same way if I have to succeed is complete nonsense, because the two, the two situations are completely different".
In a new documentary celebrating his 70th birthday, Britain's Prince Charles spoke for the first time about what sort of king he will be, saying he will shift gears once he takes on the role of the monarch.
The Prince of Wales has been championing environmental and social issues for many years and the Duchess of Cornwall said he was "pretty impatient" to get things done.
He said: "But I always wonder what meddling is, I mean I always thought it was motivating but I've always been intrigued, if it's meddling to worry about the inner cities as I did 40 years ago and what was happening or not happening there".
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During the visit, Prince Charles discussed the world's plastic crisis and was also gifted a portrait of himself made from recycled materials.
William says in the documentary: "I want to be my own man and take my own style, my own passions and my own interests my way, and do things slightly differently".
Charles' supporters say his causes - such as helping disadvantaged young people find work, inter-faith dialogue and campaigning against throwaway plastic - are often prescient. Appealing to Charles to slow down, he says: "I would like him to have more time with the children".
It's been almost six months since Prince Harry and Meghan Markle said, "I do", in front of the world's media in Windsor Castle.
"For him that's a fantastic opportunity to step up and be that support, and you know he's our father so of course he's gonna be there for us". "I suspect quite a few of you may too have grandchildren or will do soon", he said, according to the Telegraph. "And I would love to tell him to pace himself, but I'm afraid that's not gonna happen".