Jimmy Buffett is focusing on his health. The 76-year-old musician shared on Thursday that he has been forced to reschedule his concert in Charleston, South Carolina, which was originally set to take place on Saturday, May 20 at the Credit One Stadium.The «Margaritaville» singer shared a note with his fans on his website about the reason for the delay to the show, writing, «I had a sudden change of plans this week that affected us all.