PARIS - The Rolling Stones, celebrating 50 years in rock music, gave their first concert in five years at a small Paris venue late Thursday, wowing an audience who paid just 15 euros each ($20) to see the surprise gig. “I can’t believe we’re all still standing up - you’d think by now one or two of us would be sitting down, but we’re not,” lead singer Mick Jagger told the small crowd at the Trabendo club in northeast Paris.