phyrebyrd writes: Brooke Greenberg is the size of an infant, with the mental capacity of a toddler. She turned 16 in January. Brooke hasn't aged in the conventional sense. Dr. Richard Walker of the University of South Florida College of Medicine, in Tampa, says Brooke's body is not developing as a coordinated unit, but as independent parts that are out of sync. She has never been diagnosed with any known genetic syndrome or chromosomal abnormality that would help explain why. Brooke's hair and her nails are the only two things that grow, Howard said. "She has pajamas and outfits that are 10 or 12 years old," he said.