Werner syndrome is a rare genetic disorder characterized by premature aging symptoms beginning in early adulthood such as graying hair, a thin body build, and bird-like facial features. It is caused by mutations in the WRN gene and inherited in an autosomal recessive pattern. People with Werner syndrome typically die of heart disease or cancer in their late 40s or early 50s as their bodies age at an accelerated rate. There is no cure for Werner syndrome, but managing health conditions like diabetes and monitoring cholesterol levels is recommended.