Hello how may I help you? I want to know who the world's tallest person is The tallest person to ever live was Robert Wadlow Do you want to hear more? I want to hear more about him He was 8 feet 11 inches tall He was a big guy then. Did he have medical issues? Yes he died at the age of 22 due to complications from an infection He was still growing at the time Very sad. Did he have a wife or child No He was called the Alton Giant because he was from Alton Illinois You are very smart. I have learned a lot Thanks!