Hayley Okines is one of the most recognisable faces of progeria, an incredibly rare condition that causes signs of old age in children. Occurring just once in eight million people, the genetic mutation physically ages a sufferer's body eight times faster than normal. With unique, intimate access to Hayley and her family, this documentary follows the young girl over a three-year period, beginning with her trip to Boston to start medical trials in 2007.

Over the past three years, there have