There is only one other child in Canada with the disease, according to Madley.

CNN: Advances in kids' early aging disease

When Devin was born, said Ms. Madley, she was told there were no treatments for progeria.

WSJ: Progeria Drug Study Helps in Search for Clues on Aging

The exaggerated drawl of bassist Oliver Sim precedes the more human-scale croon of guitarist Romy Madley Croft.

NPR: The xx: Switching Roles In Song