The Prince of Wales, 72, is the Queen’s oldest son and next in line for the throne. Royal author, Clive Irving, said Prince Charles was “entirely unsuitable” to be the King of England.
The expert compared the Prince of Wales to his “timeless” mother.
Speaking to Australia’s Today Extra, Mr Irving said: “The Queen seems more modern than Charles.
“She’s very much timeless, whereas Charles is an 18th-century figure.”
Mr Irving, who wrote the new biography ‘The Last Queen’, claimed Prince Charles likes to “have sycophants around him, which isn’t a good sign of a future ruler”.
The royal author likened the Prince of Wales’ future rule of the monarchy to “driving over a cliff”.
In his new biography, Mr Irving said Her Majesty will likely be the last Queen of England.
He wrote: “Queen Elizabeth II is the longest-reigning monarch in British history and will likely be the last queen of England.”
Mr Irving explained how the Queen will be an “outstanding” figure in history.
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“People may tell you how she feels, but they don’t really know.”
The royal expert added: “She understood from the word go, when she became queen in 1952, that you have to sustain the mystery.
“The person is not the point, the crown is the point, the institution is the point.”
Mr Irving also claimed that some members of the Royal Family are “freeloading”.
He said: “While the whole opera of the royal family is a great attraction, it’s outlived it’s time in terms of its grander purpose.
“Lots of members of the royal family are freeloading off the idea of the royal family.”
Mr Irving noted Prince Harry and Meghan Markle’s step down from royal duties as important and believes the Royal Family needs a “great trimming-down”.
He added: “They represent the 21st century. They couldn’t be themselves inside the cage.”
Meghan and Harry shocked the nation last year when they decided to step down as senior members of the Royal Family.
The couple have since signed deals with the streaming giants Netflix and Spotify in a bid to achieve financial independence.
Mr Irving said the Sussexes’ Netflix deal was a “very good idea”.