Californian Johnny Strange was only 17-years old in 2009 when he finalized climbing each of the tallest mountains on every contiente: the “7 Summits”. He was they youngest person to complete the Seven Summits at the time. Johnny Strange was only 20-years old when he completed the “Explorer’s Grand Slam”, which means he’d summited each of the “7 Summits” & trekked to both the North & South Poles. He is still the youngest person to complete the “Explorer’s Grand Slam”. Johnny Strange was only 23-years-old when he died while Wingsuit BASE jumping yesterday.