How old was Bethany Hamilton when she was attacked by the tiger shark?

Bethany Hamilton was attacked by the tiger shark on October 31, 2003. Around 7:30 am, she was lying on her surfboard with her left arm dangling in the water. That's when the shark attacked her, and she lost her left arm. She was rushed to a nearby hospital, and took the place of her father in the operation room (her father was about to have knee surgery). After about a week of recovering, Bethany was able to return home.