From a biological cellular level, the first cell of Queen Elizabeth to manifest in this cosmos, appeared in the year 1900. This is due to the fact her mother was born in 1900. It is hard to say exactly when, but current reigning Queen Alexandra Mary Elizabeth II will turn 114 years in 2014.
The neat thing is that the King of Siam, Bhumibol Adulyadej, is Queen Elizabeth's Cellular Temporal Siamese Twin. Reason being both of these first of Royal Cells arrived on planet Earth in the same year - 1900. King Bhumibol Adulyadej's mother, Srinagarindra, was born in 1900. Note that Queen Elizabeth is a few months older.
Also note Joan Rivers is also a part of the group, since her mother Meyer C. Molinsky was born December 7, 1900.