She was 20 years old, but had the body and mind of a girl barely 2. Brooke Greenberg baffled doctors and scientists around the world for years, because she simply never aged.

She suffered from the mysterious “X Syndrome”, a condition so strange that it has only been detected in a handful of cases on the planet. While other people grew, she remained trapped in a kind of “eternal childhood”. She survived strokes, severe ulcers, and even slept for two weeks straight. Her death at 20 left more questions than answers.

And perhaps the most unsettling mystery… is that no one managed to explain why she never aged.

