World's Tallest Man May Have Stopped Growing Thanks to treatment by researchers at the University of Virginia Medical Center, the world's tallest man may have reached his peak. Measuring at 8-feet-3 inches, 29-year-old Sultan Kosen of Turkey is listed in the 2011 Guinness World Records at the tallest living man. Courtesy Guinness World Records The world's tallest man, Sultan Kosen of Turkey, walks in New York's Times Square in this September 2009 photo. Kosen visited U.Va. in May 2010 for treatment for a disorder called acromegaly, which is usually caused by a tumor in the pituitary gland. The Richmond Times-Dispatch (http://bit.ly/AtJeHK) reports that Kosen was placed on a new medication that could potentially help control the production of growth hormone and stop his continued growth. According to U.Va. officials, doctors in Turkey say Kosen has stopped growing. Information from: Richmond Times-Dispatch, http://www.timesdispatch.com