Daredevil great-grandma marked milestone with adrenaline-fueled stunts . Birthday jump as third skydive after taking up the hobby at 100 . Supergran wanted to swim with sharks to highlight perils of overfishing .
Daredevil great-grandma marked milestone with adrenaline-fueled stunts . Birthday jump as third skydive after taking up the hobby at 92 . Supergran wanted to swim with sharks to highlight perils of overfishing .