Queen Elizabeth II: reign

1. Elizabeth has been Queen since 6 February 1952.

2. Queen Elizabeth II ascended the throne on February 6, 1952 upon the death of her father, King George VI. Her Coronation, at Westminster Abbey, followed on June 2, 1953.In UK.
3. 10 September 2015, at the age of 89, she will surpass as the longest reigning monarch in British history.

These is four longest reigning monarchs in Britain:

• Edward III 1327-1377 (50 years)
• James VI Of Scotland( He was also first King of England)1567-1625 (57 years)
• King George III 1760-1820 (59 years)
• Queen Victoria 1837-1901 (63 years)

http://projectbritain.com/theQueen.htm