Justin Bieber is now 21, an age at which many people assumed (even hoped) that the prodigy-turned-superstar-turned-pariah would be a punchline, a footnote or worse. Instead, he has emerged from his breakup with Selena Gomez (“It’s a love that never really diesâ€) and an epic two-year tabloid spiral and reinvented himself — emotionally, spiritually and musically.