Question: When was the older sister of Princess Benedikte of Denmark born?

full_context: Document 1: Princess Elisabeth of Denmark: Princess Elisabeth of Denmark, {'1': ", '2': ", '3': 'RE', '4': "} ("Elisabeth Caroline-Mathilde Alexandrine Helena Olga Thyra Feodora Estrid Margrethe Désirée"; born 8 May 1935 in Copenhagen) is the daughter of Hereditary Prince Knud and Hereditary Princess Caroline-Mathilde of Denmark, and is a first cousin of the present Danish monarch, Queen Margrethe II.
Document 2: Princess Tatiana of Sayn-Wittgenstein-Berleburg: Princess Tatiana of Sayn-Wittgenstein-Berleburg (Tatiana Louise Ursula Therese Elsa; born 31 July 1940) is the fourth child and second daughter of Gustav Albrecht, 5th Prince of Sayn-Wittgenstein-Berleburg, and his wife, Margareta Fouché d'Otrante, and younger sister of Prince Richard of Sayn-Wittgenstein-Berleburg, the husband of Princess Benedikte of Denmark. Tatjana is the former wife of the late Moritz, Landgrave of Hesse, from 1980 head of the House of Hesse. Their marriage took place in the summer of 1964 in Gießen. They divorced in 1974.
Document 3: Gustav, 7th Prince of Sayn-Wittgenstein-Berleburg: Gustav, 7th Prince of Sayn-Wittgenstein-Berleburg (Gustav Frederik Philip Richard; born 12 January 1969 in Frankfurt-am-Main, Germany), is the eldest child and only son of Princess Benedikte of Denmark and Richard, 6th Prince of Sayn-Wittgenstein-Berleburg.
Document 4: Princess Alexandra of Sayn-Wittgenstein-Berleburg: Princess Alexandra of Sayn-Wittgenstein-Berleburg, Countess von Pfeil und Klein-Ellguth (Alexandra Rosemarie Ingrid Benedikte; born 20 November 1970 in Copenhagen, Denmark), is the first daughter and second of three children of Prince Richard of Sayn-Wittgenstein-Berleburg and Princess Benedikte of Denmark).
Document 5: Princess Margaretha of Sweden: Princess Margaretha of Sweden (Margaretha Sofia Lovisa Ingeborg; 25 June 1899 – 4 January 1977) was a member of the Swedish Royal Family and a Princess of Denmark by marriage, the eldest sister of Märtha, Crown Princess of Norway, Queen Astrid of the Belgians and Prince Carl Bernadotte.
Document 6: Mary, Crown Princess of Denmark: Mary, Crown Princess of Denmark, Countess of Monpezat, {'1': ", '2': ", '3': 'R.E.', '4': "} (Mary Elizabeth; "née" Donaldson; born 5 February 1972) is the wife of Frederik, Crown Prince of Denmark. Frederik is the heir apparent to the throne, which means that should Frederik succeed, she will automatically become Queen of Denmark.
Document 7: Margrethe II of Denmark: Margrethe II (Danish: "Margrethe 2." , ] ; Faroese: "Margreta 2." ; Greenlandic: "Margrethe II" ; full name: "Margrethe Alexandrine Þórhildur Ingrid"; born 16 April 1940) is the Queen of Denmark. She is also the supreme authority of the Church of Denmark and Commander-in-Chief of the Danish Defence. Born into the House of Glücksburg, a royal house with origins in Northern Germany, she was the eldest child of Frederick IX of Denmark and Ingrid of Sweden. She succeeded her father upon his death on 14 January 1972, having had become heir presumptive to her father in 1953, when a constitutional amendment allowed women to inherit the throne. On her accession, Margrethe became the first female monarch of Denmark since Margaret I, ruler of the Scandinavian kingdoms in 1375–1412 during the Kalmar Union. In 1967, she married Henri de Laborde de Monpezat, with whom she has two sons: Crown Prince Frederik (born 1968) and Prince Joachim (born 1969). She has been on the Danish throne for 45 years, becoming the second-longest-reigning Danish monarch after her ancestor Christian IV.
Document 8: Princess Margaretha, Mrs. Ambler: Princess Margaretha, Mrs. Ambler, (Margaretha Désirée Victoria; born 31 October 1934) is a Swedish princess, the eldest sister of King Carl XVI Gustaf of Sweden and also first cousin of Queen Margrethe II of Denmark.
Document 9: Princess Nathalie of Sayn-Wittgenstein-Berleburg: Princess Nathalie of Sayn-Wittgenstein-Berleburg (Nathalie Xenia Margrethe Benedikte; born 2 May 1975, in Copenhagen, Denmark) is the youngest daughter of Prince Richard of Sayn-Wittgenstein-Berleburg and Princess Benedikte of Denmark and niece of Queen Margrethe II of Denmark and Queen Anne-Marie of Greece.
Document 10: Ingrid of Sweden: Ingrid of Sweden (Ingrid Victoria Sofia Louise Margareta; 28 March 1910 – 7 November 2000) was Queen of Denmark from 1947 until 1972 as the wife of King Frederick IX.
Document 11: Frederik, Crown Prince of Denmark: Frederik, Crown Prince of Denmark, Count of Monpezat, {'1': ", '2': ", '3': 'RE, SKmd', '4': "} (Frederik André Henrik Christian; born 26 May 1968) is the heir apparent to the throne of Denmark. Frederik is the elder son of Queen Margrethe II and Henrik, the Prince Consort.
Document 12: Succession to the Danish throne: The Danish Act of Succession, adopted on 27 March 1953, restricts the throne to those descended from Christian X and his wife, Alexandrine of Mecklenburg-Schwerin, through approved marriages. Succession is governed by absolute primogeniture.
Document 13: Princess Isabella of Denmark: Princess Isabella of Denmark, Countess of Monpezat (Isabella Henrietta Ingrid Margrethe; born 21 April 2007), is the second child and elder daughter of Crown Prince Frederik and Crown Princess Mary.
Document 14: Princess Benedikte of Denmark: Princess Benedikte of Denmark, Princess of Sayn-Wittgenstein-Berleburg {'1': ", '2': ", '3': 'RE, SKmd, D.Ht.', '4': "} (Benedikte Astrid Ingeborg Ingrid, born 29 April 1944) is the second daughter of King Frederick IX of Denmark and Ingrid of Sweden. She is the younger sister of the reigning Queen of Denmark, Margrethe II, and the older sister of Queen Anne-Marie of Greece.
Document 15: Alexandrine of Mecklenburg-Schwerin: Alexandrine of Mecklenburg-Schwerin (24 December 1879 – 28 December 1952) was Queen of Denmark as the spouse of King Christian X. She was also Queen of Iceland from 1 December 1918 to 17 June 1944.
ground_truth: 16 April 1940