Lady Gaga, the pop behemoth with a penchant for the outlandish, met her match at the Prudential Center on Saturday in the form of rocks original provocateur, Sir Mick Jagger. He may well pushing 70 but when Mick Jagger sang with 26-year-old pop tour de force on the epic (and nihilistic) Gimme Shelter, the boundaries of age seemed to melt away. Of course, Micks never been afraid to hold his own with a younger woman and so it was that this scintillating pairing proved to be one of the highlights of the Rolling Stones five-gig 50 and Counting Tour, which finished in Newark on Saturday night.