At her 16 years old, Brooke Greenberg weighs 16 pounds and is 30 inches tall. Due to a mysterious disease, she doesn’t grow. Dr. Richard Walker said: "There've been very minimal changes in Brooke's brain. Various parts of her body, rather than all being at the same stage, seem to be disconnected." Doctors hope that this single case will perhaps help to shed light on the mystery of aging process. On the first photo, Brooke is one-years old. Look how she has changed over the last 15 years.