question: Who is younger, Isaac P. Walker or Nakkhatra Mangala?
context: [["Wee Willie Walker", ["Willie Earl Walker( December 21 or 23, 1941 \u2013 November 19, 2019), known as Willie Walker or Wee Willie Walker, was an American soul and blues singer."]], ["Ranginui Walker", ["Ranginui Joseph Isaac Walker( 1 March 1932 \u2013 29 February 2016) was a New Zealand academic and writer of M\u0101ori and Lebanese descent."]], ["Dmitri Varfolomeyev (footballer, born 1978)", ["Dmitri Nikolayevich Varfolomeyev( born 15 March 1978 in Leningrad) is a former Russian football player.", "He is a younger brother of Sergei Varfolomeyev."]], ["Roman Smishko", ["Roman Smishko is a retired Ukrainian professional footballer who played as a goalkeeper.", "He is a younger brother of Ukrainian defender Bohdan Smishko."]], ["Isaac P. Walker", ["Isaac Pigeon Walker( November 2, 1815 March 29, 1872) was an American politician who served as a U.S. Senator from Wisconsin.", "Walker was born in Virginia and moved with his family to Illinois in 1825.", "He practiced law in Springfield, Illinois, and served one term in the Illinois House of Representatives.", "He moved to Wisconsin in 1841 and practiced law in the Milwaukee area.", "He served in Wisconsin's territorial legislature from 1847 to 1848.", "When Wisconsin was admitted as a state in 1848, Walker was elected as a Democrat to represent Wisconsin in the United States Senate, where he served until 1855.", "He is buried at Forest Home Cemetery in Milwaukee.", "Isaac Walker's older brother, George H. Walker, was a founder and mayor of Milwaukee, Wisconsin."]], ["Nakkhatra Mangala", ["Nakkhatra Mangala, Prince of Chanthaburi II( 4 January 1897 \u2013 11 February 1953), was the eldest son of Kitiyakara Voralaksana, Prince of Chanthaburi I and Princess Apsarasaman Kitiyakara.", "After his daughter Mom Rajawongse Sirikit Kitiyakara entered a royal marriage with King Bhumibol Adulyadej, he was promoted to General Prince of Chanthaburi Suranath, HH Prince Nakkhatra Mangala Kitiyakara in the past) by royal command in 1952.", "He represented the Ministry of Foreign Affairs as the ambassador of the kingdom of Thailand to the Court of St James's in the United Kingdom, and to the government of France Prince Nakkhatra married Mom Luang Bua Kitiyakara( Sanidvongs) and they had four children:"]], ["Vadim Vlasov", ["Vadim Nikolayevich Vlasov( born 19 December 1980) is a former Russian football player.", "He is a younger brother of Dmitri Vlasov."]], ["Anton Shunto", ["Anton Shunto( born 31 May 1988) is a Belarusian professional footballer.", "As of 2019, he plays for Molodechno.", "He is a younger brother of Denis Shunto, who is a founder and former president of Krumkachy Minsk."]], ["Milo\u0161 Zli\u010di\u0107", ["Milo\u0161 Zli\u010di\u0107( born 29 December 1999) is a Serbian football forward.", "He is a younger brother of Lazar Zli\u010di\u0107."]], ["Busba Kitiyakara", ["\" Than Phu Ying\" Busba Kitiyakara Sathanapong( born 1934) was the daughter of Mom Chao Nakkhatra Mangala Kitiyakara and younger sister of Sirikit Kitiyakara, who became Queen of Thailand."]]]
supporting_facts: [["Isaac P. Walker", 0], ["Nakkhatra Mangala", 0]]
evidences: [["Isaac P. Walker", "date of birth", "November 2, 1815"], ["Nakkhatra Mangala", "date of birth", "4 January 1897"]]
answer: Nakkhatra Mangala