At first glance Brooke Greenberg may look like your ordinary infant, however she's anything but. Brooke has been a toddler for twenty years and doctors are unable to explain why.

This isn't "The Curious Case of Benjamin Button" or equivalent to the movie "Jack" starring Robin Williams, this is a the story of a child who couldn't physically or mentally grow old.

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Brooke, a Maryland resident, is unable to speak, still has baby teeth lining her gums, and is pushed in a stroller.

Her father, Howard Greenberg, stated that from age one to four Brooke was developing but as she hit the age of five, she stopped.

This growth stunt has boggled the minds of even the most prestigious doctors in medicine, which leaves Brooke with no formal diagnose for her disease. Thus said, they are calling this developmental issues "Syndrome X".

Doctors suggest that Brooke may be suffering from a gene mutation that switched off her ability to mature.

Mr. and Mrs. Greenburg, along with Brooke's sister, attended "Katie" where they explained a day in the life of being a member of their family.

Brooke requires around the clock care from her parents. They feed her through a tube because swallowed food could back up her lungs causing pneumonia due to her esophagus being so small.

The mystery doesn't just end here. Scientist believes that Brooke's unique genetic code could be helpful in finding a way to cure diseases such as Parkinson's, Alzheimer's, heart disease or many forms of cancer.

Dr. Eric Schadt is the director of the Icahn Institute for Genomics and Multiscale Biology at The Mount Sinai Medical Center in New York who is currently processing the sequencing of Brooke's genome, which is compiled of two long strings of letters on from each parent.

Brooke's mystery could be the answer for the many diseases that affect people today.