Queen Elizabeth Celebrates Her 91st Birthday

Britain's Queen Elizabeth is the world's oldest and longest-reigning monarch. On Friday, she will celebrate her 91st birthday in a usual low-key fashion. Artillery gun salutes in London's Hyde Park and at the Tower of London will mark the occasion. The Queen normally spends her birthday privately. Personally, she has no formal engagements planned herself. Despite her age, her majesty still regularly carries out official duties.