A GIANT teenager has reached a record-breaking height of 7ft 8ins – and is still growing. Broc Brown, who was officially the world’s tallest teenager before becoming too old for the 18-and-below classification, is growing at the rate of six inches a year. If he maintains that rate, the 19-year-old from Michigan could easily surpass the current world’s tallest man, Sultan Kosen, who stands at 8ft 2ins.