If Clow is the youngest, Irving Kahn sets world record as been the oldest stock broker. Not to enter the stock market like Clow but to have been in the industry since 1928. Irving Kahn is 106 year old and has measured the highs and lows of the stock market since 1928. He is named as the oldest living investment professional who has an asset worth $700 million under the management of Kahn Brothers Group Inc. He turned 106 in December 2011. From the Great depression, two world wars and the 1987 market crash in U.S. Kahn has also witnessed the Occupy Wall Street. Kahn presently holds 20 stocks, but is not a regular stock market follower even though he has a Bloomberg terminal on his desk. Kahn still has the practice of going to office everyday whereas his two oldest sons who are in their 70's have already retired. "Well when I got to the Street in '28/'29 it was much more of a rich man's game -- not that I was rich, but I mean it was designed for banks, insurance companies, railroads or public utilities," he said in an interview. "It's no longer a rich man's business. It's a business for everybody," as quoted by Business Insider. "Being in a changeable world, which is always interesting," Irving Kahn said. "That's one good aspect of Wall Street, you never know what the next hour will do." What is more interesting about Irving and his is family is that he has two centenarian siblings: an older sister who's 109 and a younger brother who's 101. This has become a curious research study for Dr. Nir Barzilai at Albert Einstein College of Medicine's Institute for Aging Research.