Prince Charles became heir apparent to the throne when he was just three years old, a title he's held since the death of his grandfather, George VI, in 1952.
Now the Prince of Wales has reached another royal milestone, becoming the oldest person to be crowned king in British history.
The new grandfather just surpassed previous record holder, William IV, who was crowned in 1830 at the age of 64 years, 10 months and five days.
Queen Elizabeth II, 87, holds the title of oldest monarch in British history, and with the Queen still in excellent health, it may be some time before Prince Charles ascends the throne.
The prince has addressed questions as to whether he is anxious to be king in the past with good humour.
"Impatient? Me? What a thing to suggest! Yes, of course I am," he joked at his birthday party last year. "I'll run out of time soon. I shall have snuffed it if I'm not careful."
Prince Charles already holds several other royal records, including the third-longest serving Prince of Wales and the longest-serving heir to the throne in British history.