Progeria (also known as "Hutchinson-Gilford progeria syndrome")'s an extremely rare genetic condition wherein symptoms resembling aspects of aging are manifested at an early age. About 1 in 8 million babies are born with this condition, and most affected children have a life span of around 13 years, although many have been known to live into their late teens and early twenties. It's a genetic condition but occurs as a new mutation (sporadically) and isn't usually inherited, although there's one… (More on Progeria)