Here's a look at 'Today in Rock History' featuring: "Dancing with the Stars" co-host and Fox Sports' lead NFL sideline reporter, Erin Andrews is 42. Green Day bassist, Mike Dirnt is 48. Will Arnett is 50. Motley Crue guitarist, Mick Mars is 69. In 1968, the Big Mac debuted at McDonald's. In 2012, Adam "MCA" Yauch of the Beastie Boys died of cancer. He was 47. R.I.P.