How Old Will The Queen Be? Why Elizabeth Has Two Birthdays

April 21 marks Queen Elizabeth’s official birthday and the longest-reigning monarch in the world will quietly celebrate her 91st birthday.

Yet, in June, the queen will also celebrate her birthday all over again. While Her Majesty was actually born on the April date, it’s a time-honored British royal tradition for a ruling king or queen to celebrate two birthdays in a calendar year.