Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The term DNA repair-deficiency disorders refers to various health conditions that are caused by poor DNA repair function and lead to premature aging of tissues, organs and various systems of the human body. Not only individuals affected by these disorders have physical appearance of the elderly, they also suffer from age-related diseases while being young. Learn more about the diseases that lead to premature aging in this book.