Progeria is an extremely rare genetic condition wherein symptoms resembling aspects of aging

Senescence

Senescence or biological aging is the change in the biology of an organism as it ages after its maturity. Such changes range from those affecting its cells and their function to those affecting the whole organism...

 are manifested at an early age. The word progeria comes from the Greek words "pro" (πρό), meaning "before", and "géras" (γῆρας), meaning "old age". The disorder has very low incidences and occurs in an estimated 1 per 8 million live births. Those born with progeria typically live to their mid teens and early twenties.