Queen Elizabeth came to the throne in February 1952 with the passing of her father, King George VI. Her coronation was June 2, 1952 and today she celebrates her Diamond Jubilee. She celebrated her Silver Jubilee (25 years) in 1977 and her Golden Jubilee (50 years) in 2002. The only other British monarch to celebrate a Diamond Jubilee was Queen Victoria in 1897
The Queen is Head of State of the UK and 15 other Commonwealth realms. The elder daughter of King George VI and Queen Elizabeth, she was born in 1926 and became Queen at the age of 25, and has reigned through more than five decades of enormous social change and development. The Queen is married to Prince Philip, Duke of Edinburgh and has four children and eight grandchildren.
From The official website of The British Monarchy.
The Queen is seen here in rare footage.