25years old
25
Mary, Queen of Scots was only 6 days old when she took over the throne of Scotland. She inherited the throne on December 14, 1542.
Queen Elizabeth became queen long before Shakespeare was a glint in his father's eye. He was born in the sixth year of her reign.
She became Queen at age 26 when her father passed away but her formal cornoration took place the following year.
It is beleived that he took over the throne of Ancient Egypt at roughly 9 years of age.
He Was 3
She was forced into marrying her brother, Ptolemy XII at age 12, but took the Egypt throne when she was 17.
She was born in February 1665 and accended the throne in 1702 so she was 37 years old.
Queen Victoria was born on 24th May 1819, and became Queen of Great Britain and Ireland on 20th June 1837 at the age of 18. Her coronation took place on 28th June 1838, when she was 19 years old.
Matilda of Flanders was 52 years old when she passed away.
Her father died when she was 6 days old leaving her the only heir to the throne.
If you say he took over in 1928, he took over when he was 50.
Queen Elizabeth II was assume to the throne because of her father's death King George VI and Queen Elizabeth II was only 25 years old.