Queen Elizabeth II was born 21 April 1926, and is now 86 years old. When she was born, she was 3rd in line for the throne, but after the abdication crisis in 1937, her father was crowned king. He died unexpectedly when Elizabeth was only 25 years old. She was a young wife and mother who had never expected to be Queen, and now she has reigned for 60 years!
After Queen Victoria, who reigned for 63 years, Elizabeth II is the second longest-reigning monarch, and she is the 40th monarch in England since William the Conqueror. These and other fascinating tidbits about our beloved Queen can be found on the official Diamond Jubilee website.
Also, I highly recommend watching ABC's coverage of the Jubilee events:http://abcnews.go.com/blogs/headlines/2012/05/abc-news-celebrates-her-majesty-queen-elizabeth-iis-diamond-jubilee-with-unprecedented-access-to-the-royal-family-and-celebration-concert/
One more thing: today was the River Thames Boat Pageant. Look, there's the Queen!