Nineteen year old Robert Wadlow

Nineteen year old Robert Wadlow at 8 ft 7 in is the tallest person in recorded history. Wadlow reached 8 ft 11 in height and weighed 439 lb at his death at age 22. His great size and his continued growth in adulthood were due to hyperplasia of his pituitary gland, which results in an abnormally high level of human growth hormone. He showed no indication of an end to his growth even at the time of his death.