Brooke Greenberg continues to baffle her family and doctors.
At 16-years-old, Brooke weighs 16 pounds and stands 2 feet, 6 inches tall. She can’t speak, but she can express frustration and happiness.
In other words, Brooke’s body and mind are that of a toddler.
"Why doesn’t she age?" Brooke’s father, Howard Greenberg said on ABC News. "Is she the fountain of youth?"
Brooke, who lives in Maryland, still has baby teeth, and her bones are those of a 10-year-old. However, her hair and nails grow consistently.
Doctors think Brooke has a genetic mutation that inhibits her growth.