LONDON (AP) — When Britain's 21-year-old Princess Elizabeth married 26-year-old Lieutenant Philip Mountbatten at Westminster Abbey in 1947, the wedding sparked joy and celebration in a country just recovering from World War II. Seven decades on, the couple who would become Queen Elizabeth II and Prince Philip — now 91 and 96, respectively — are still going strong, their marriage a bedrock in British public life amid a world of change. On Monday, they mark their 70th wedding anniversary, though officials say the milestone will be celebrated privately and no public events are planned.