Question: Who is older, Benjamin Grahm or Irving Kahn?

full_context: Document 1: The Great Crash, 1929: The Great Crash, 1929 is a book written by John Kenneth Galbraith and published in 1955; it is an economic history of the lead-up to the Wall Street Crash of 1929. The book argues that the 1929 stock market crash was precipitated by rampant speculation in the stock market, that the common denominator of all speculative episodes is the belief of participants that they can become rich without work and that the tendency towards recurrent speculative orgy serves no useful purpose, but rather is deeply damaging to an economy. It was Galbraith's belief that a good knowledge of what happened in 1929 was the best safeguard against its recurrence.
Document 2: George Soros: George Soros ( or ; Hungarian: "Soros György" , ] ; born György Schwartz, August 12, 1930) is a Hungarian-American investor, business magnate, philanthropist, and author. Soros is one of the world's most successful investors. As of May 2017, he had a net worth of $25.2 billion, ranking among the 30 richest people in the world.
Document 3: Irving Kahn: Irving Kahn (December 19, 1905 – February 24, 2015) was an American investor and philanthropist. He was the oldest living active investor. He was an early disciple of Benjamin Graham, the creator of the value investing methodology. Kahn began his career in 1928 and continued to work until his death. He was chairman of Kahn Brothers Group, Inc., the privately owned investment advisory and broker-dealer firm that he founded with his sons, Thomas and Alan, in 1978.
Document 4: Li Ka-shing: Sir Ka-shing Li, GBM, KBE, JP (born 29 July 1928 in Chaozhou, China) is a Hong Kong business magnate, investor, and philanthropist. As of September 2017, Li is one of the wealthiest people in Asia, with an estimated net worth of US$34.4 billion. He is currently the chairman of the board for CK Hutchison Holdings; through it, he is the world's leading port investor, developer, and operator, and the largest health and beauty retailer in Asia and Europe.
Document 5: Joshua Kushner: Joshua Kushner (born June 12, 1985) is an American businessman and investor. He is the founder and managing partner of the investment firm Thrive Capital, co-founder of Oscar Health, and the son of real estate magnate Charles Kushner. His brother is Jared Kushner, the son-in-law and senior advisor of the US President Donald Trump.
Document 6: Guy Spier: Guy Spier (born February 4, 1966) is a Zurich-based investor and author of a book on investing entitled "The Education of a Value Investor". He is well known for bidding US$650,100 with Mohnish Pabrai for a charity lunch with Warren Buffett in June 2007. In 2009, he was featured in "the Checklist Manifesto", by Atul Gawande regarding his use of checklists as part of his investment process.
Document 7: John Kenneth Galbraith: John Kenneth "Ken" Galbraith, OC ( , October 15, 1908 – April 29, 2006) was a Canadian-born economist, public official, and diplomat, and a leading proponent of 20th-century American liberalism. His books on economic topics were bestsellers from the 1950s through the 2000s, during which time Galbraith fulfilled the role of public intellectual. As an economist, he leaned toward Post-Keynesian economics from an institutionalist perspective.
Document 8: Benjamin Graham: Benjamin Graham ( ; born Benjamin Grossbaum; May 9, 1894 – September 21, 1976) was a British-born American investor, economist, and professor. He is widely known as the "father of value investing," and wrote two of the founding texts in neoclassical investing: "Security Analysis" (1934) with David Dodd, and "The Intelligent Investor" (1949). His investment philosophy stressed investor psychology, minimal debt, buy-and-hold investing, fundamental analysis, concentrated diversification, buying within the margin of safety, activist investing, and contrarian mindsets.
Document 9: John Maynard Keynes: John Maynard Keynes, 1st Baron Keynes {'1': ", '2': ", '3': ", '4': "} ( ; 5 June 1883 – 21 April 1946), was a British economist whose ideas fundamentally changed the theory and practice of macroeconomics and the economic policies of governments. He built on and greatly refined earlier work on the causes of business cycles, and is widely considered to be one of the most influential economists of the 20th century and the founder of modern macroeconomics. His ideas are the basis for the school of thought known as Keynesian economics and its various offshoots.
Document 10: Irving B. Kahn: Irving Berlin Kahn (c.1917–1994) was an American media proprietor. He was the founder of TelePrompTer Corporation and Cable TV.
Document 11: Paul H. Irving: Paul H. Irving is a social sector leader and entrepreneur focused on changing the culture of aging. As founder and chairman of the Center for the Future of Aging at Milken Institute and USC Davis School of Gerontology distinguished scholar in residence, Irving speaks, writes and convenes influencers in health, business, academia, philanthropy, media and other domains who are committed to redefining the public narrative about the roles and value of older adults. Irving's work has drawn increasing attention from across the country and the world. In 2016, PBS Next Avenue described him as "a key driver of the purposeful aging movement."
Document 12: Kirk Kerkorian: Kerkor "Kirk" Kerkorian (June 6, 1917 – June 15, 2015) was an Armenian-American businessman, investor, and philanthropist. He was the president and CEO of Tracinda Corporation, his private holding company based in Beverly Hills, California. Kerkorian is known for having been one of the important figures in the shaping of Las Vegas and, with architect Martin Stern, Jr. described as the "father of the mega-resort". He built the world's largest hotel in Las Vegas three times: the International Hotel (opened in 1969), the MGM Grand Hotel (1973) and the MGM Grand (1993). He purchased the Metro-Goldwyn-Mayer movie studio in 1969.
Document 13: Warren Buffett: Warren Edward Buffett ( ; born August 30, 1930) is an American business magnate, investor, and philanthropist. Buffett serves as the Chief Executive Officer and Chairman of Berkshire Hathaway. He is considered by some to be one of the most successful investors in the world, and as of August 2017 is the second wealthiest person in the United States, and the fourth wealthiest in the world, with a total net worth of $76.9 billion.
Document 14: Charles R. Schwab: Charles Robert Schwab (born July 29, 1937) is an American investor, financial executive, and philanthropist. He is the founder and chairman of the Charles Schwab Corporation. He pioneered discount sales of equity securities starting in 1975. His company became by far the largest discount securities dealer in the United States. He retired as CEO in 2008, but remains chairman and is the largest shareholder.
Document 15: Kenneth C. Griffin: Kenneth C. Griffin (born October 15, 1968) is an American investor, hedge fund manager, and philanthropist. He is the founder and chief executive of the global investment firm Citadel, founded in 1990. s of March 2015 , Citadel is one of the world's largest alternative investment management firms with an estimated $25 billion in investment capital. Citadel's group of hedge funds rank among the largest and most successful hedge funds in the world. "Forbes" identified Griffin as one of 2012's highest earning hedge fund managers as well as one of the Forbes 400.
ground_truth: Benjamin Graham