NEW YORK (Reuters) – Fifty years since their first London jam sessions, the Rolling Stones kicked off the U.S. leg of a brief anniversary tour with a vibrant show in New York on Saturday that belied their years – wrinkles and nostalgia aside. Drummers wearing gorilla masks warmed up the crowd packed into Brooklyn's Barclays Center as black-clad women swung their long tresses in rhythm. Mick Jagger pranced, shimmied and howled his way through the 2-1/2 hour show, pausing to reminisce about the band's history and its first New York concert at Carnegie Hall in 1964. …