Hayley Okines, who became known as the “100-year-old teenager” because of a rare genetic condition that made her age at eight times the normal rate, died Thursday in England. She was 17. Her mother, Kerry, announced her death in a Facebook post. “My baby has gone somewhere better. She took her last breath in my arms at 9:39 p.m.,” Kerry wrote. Hayley, from Bexhill in East Sussex, had recently been treated in the hospital for pneumonia but had returned home on the day she died, the BBC reports. In her 2012 autobiography, Old Before My Time, Hayley described what it was like living with Hutchinson-Gilford progeria syndrome, which causes accelerated aging. “The easiest way to explain it is it’s like my body is 100 years old when I am actually 14.