The age of the British monarchs at their coronation can be seen in the graph above. King Charles III, at 74, is the oldest monarch to be crown in British history.
The age at which monarchs are crowned has varied over time. Traditionally, monarchs were crowned as soon as possible after the death of their predecessor, regardless of their age.
The second oldest monarch to be crowned in English history was William IV. He was 64 years old when he ascended to the throne in 1830. William IV had been next in line to the throne for many years but had been passed over in favor of his older brothers.
Most monarchs, however, were crowned in their early twenties or thirties, after their predecessors had died or abdicated. Queen Victoria, for example, was 18 years old when she ascended to the throne in 1837. She was crowned the following year at the age of 19.
In modern times, the age at which monarchs are crowned has become less important. The process of succession is now well-established and formalized. Queen Elizabeth II was 25 years old when she ascended to the throne in 1952 and was crowned at the age of 27.
In conclusion, the age at which English monarchs are crowned has varied over time. Some monarchs being crowned as infants or in their sixties, while most were crowned in their early twenties or thirties. The age of the British monarchs at their coronation can be seen in the graph above.