Hayley Leanne Okines (3 December 1997 – 2 April 2015) was an English author and activist who was a sufferer of the extremely rare aging disease progeria.

Although the life expectancy for those with the condition is 13 years, Okines was part of a drug trial that had seen her surpass doctors' predictions of her projected lifespan.

Discovery Health aired a special titled Extreme Aging: Hayley's Story, which focused on the balance of the disease being currently terminal but with a possible cure on the horizon.

[3] She was featured in the second part of a three-part documentary series called Make Me Live Forever, in which presenter Michael Mosley investigated a number of proposed treatments to enable humans to extend their lifespan.

[15][16] When Jane Winiberg saw a progeria television special, she and Mark Street wrote a song about Okines and other children.