King Frederik and Queen Mary of Denmark's Children: All About

Their eldest, Prince Christian, is 18 years old.

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Denmark's King Frederik X takes throne after his mother Queen Margrethe II abdicates

Princess Mary and Crown Prince Frederik's sweet family

2,320 Prince Frederik Children Stock Photos, High-Res Pictures, and Images - Getty Images

Very modern' royals Frederik and Mary come to Danish throne after surprise abdication

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Princess Mary to become Queen of Denmark after abdication

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Princess Mary and Crown Prince Frederik's sweet family

Denmark coronation: Behind Queen Mary's dress

Queen Mary and King Frederik of Denmark's youngest children receive incredible gift

Princess Mary and Crown Prince Frederik's sweet family

Queen Mary and King Frederik's children: Everything to know about their four children, including Prince Christian