How old was Queen Elizabeth when she became queen of England?
There have been two Queen Elizabeths of England. Queen Elizabeth I became queen in November of 1558 at the age of 25 years old. She reigned for 42 years. Queen Elizabeth II became queen in February of 1952, also at the age of 25 years old. She has reigned for over 70 years and is the longest-ruling monarch of Britain.