At sweet sixteen, Japanese pop phenomenon Hatsune Miku has her whole life ahead of her. In fact, she may have an eternity, because unlike her rivals she hasn’t aged a bit since her 2007 debut. And there are no tantrums or tiaras either, despite a number-one album. This teen only needs electricity.  With her trademark cyan pigtails, tomboy necktie and thigh-high boots, Miku’s faultless performances defy her youth. But then, as a hologram, it’s not her lack of faults that has garnered legions of glowstick-waving fans, it’s how very lifelike she—and the rise of digital pop stars—has become.