When the Rolling Stones began in 1962 rock & roll was not even a decade old and the lifespan of a band was about three or four years at best. Five decades later the Rolling Stones are still filling stadiums, even as the members are now approaching their 70th birthdays. Along the way the way they perfected the art of the concert. Their infamous 1969 tour proved that rock can work in basketball arenas, and their legendary tours of 1972 and 1975 rank up amongst the greatest in rock history. They've been off the road for four years now, but don't be shocked if the machine revs up again in 2012 for a 50th anniversary tour.