Just How Does the Queen Celebrate Her Birthday?

Princess Elizabeth turned 21 when she was in Natal, South Africa on tour with her family. She gave a live speech over the radio where she famously vowed, "I declare before you all that my whole life whether it be long or short shall be devoted to your service." She was also harbouring a secret — she was very recently engaged. This was not made public knowledge until after the family had returned from South Africa.