Warner Bros. released Madonna’s 'Hard Candy' on Tuesday, her 11th studio album. But some critics wonder if the 49-year-old pop icon can maintain her success in today’s youth-dominated music industry. Madonna “must fear irrelevance,” said James Hannaham in Salon, “but if so, her distress signals remain in the subtext.” 'Hard Candy' “actually sounds youthful,” said Steven Mirkin in Variety. Madonna