A girl who has a rare premature ageing disease is making the most of teenage sleepovers and friendships after celebrating her 13th birthday, a landmark she was not expected to see.

Hayley Okines, of Bexhill, East Sussex, was diagnosed with Hutchinson-Gilford progeria syndrome when she was one.

Doctors warned her family she was unlikely to reach her teens, but they have high hopes since she began a pioneering drug treatment in the US.