Here's your daily look at 'Today in Rock History' featuring: Angels outfielder, Mike Trout it 28. Charlize Theron is 44. Bruce Dickinson is 61. He's the cancer-defeating lead singer for Iron Maiden. Today in 1997, Garth Brooks put on a free concert in New York's Central Park that drew between 250,000 and 750,000 fans. The police estimated the crowd at 250,000 . . . the promoters put it three times higher.​