LAS VEGAS, NV — Following a recent performance by a legendary band of their greatest hits, fans posted online about how they couldn't believe how much the lead singer had aged in the last 50 years. Though the crowd appeared to enjoy the show, attendees later expressed shock that the band's frontman looked so much older and worn down by life than he did when the band first hit it big in the 1970s. "Man, he really looks old now," said one fan in a social media post. "It's a far cry from the way he looked a half...