The King is “doing fine” but “won’t slow down and won’t do what he’s told”, the Queen has told a prominent author.
Camilla provided the update to author Lee Child, who appeared at Saturday’s Queen’s Reading Room Festival at Hampton Court Palace in Surrey.
The Jack Reacher writer, 69, added: “Sounds to me like a typical husband.”
Charles has recently returned to public-facing duties while still receiving treatment for an undisclosed form of cancer.
The King’s appearance at a D-Day event in Portsmouth on Wednesday was his first public speech and most high-profile appearance since his cancer diagnosis.
He is expected to take part in the upcoming Trooping the Colour ceremony, but will inspect the soldiers from a carriage rather than on horseback, it is understood.
Camilla spoke to a number of authors at the festival, including Sir Ian Rankin and Ann Cleeves.
Sir Ian said the Queen told him that “her whole family were fans of my books”.