Hello how may I help you? who is the tallest person in the world? Do you mean the tallest living person or the tallest person of all time? the tallest living person The tallest person living is Robert Wadwell. what country does he live in? He lives in Australia. how old is he? He is currently 41 years old. who was the tallest person of all time? The tallest of all time was Sami Humat.