King George IV was named King at 57 years old in 1820. ... With King Charles III taking the throne at age 73, it’s safe to presume his reign will not last more than 30 years.

King Charles III posed with his son and grandson Prince George — the two heirs to the throne — in an official portrait released by Buckingham Palace.

George III, 1738 - 1820. Reigned 1760 - 1820, by Studio of Allan Ramsay, 1763. Oil on canvas. National Galleries Of Scotland-Getty Images ...

King Charles III ascended the throne in 2022, nearly a century after his grandfather, King George VI, was reigning monarch By Gabriele Regalbuto Fox News Published September 12, 2022 9:48pm EDT ...

Though the show is fictional, the real King George III did likely suffer from mental illness. George ascended to the throne at age 22, and was King of Great Britain until his death in 1820 at age 81.