Hutchinson Gilford Progeria Syndrome, or Progeria syndrome) is an extremely rare genetic disease wherein symptoms resembling aspects of aging are manifested at a very early age. The word progeria comes from the Greek words "pro", meaning "before" or "premature", and "gēras" (γῆρας), meaning "old age". The disorder has a very low incident rate, occurring in an estimated 1 per 8 million live births. Those born with progeria typically live to their mid teens and early twenties. It is a genetic condition that occurs as a new mutation, and is rarely inherited. Although the term progeria applies strictly speaking to all diseases characterized by premature aging symptoms, and is often used as such, it is often applied specifically in reference to Hutchinson-Gilford Progeria Syndrome (HGPS).