(Or both.) Well, to be fair The Golden Age of Comic Books could also be pretty silly when it wanted to be. The Silver Age lasted from 1956 to about 1972 (although some people count everything up until 1985 as part of it, folding in the The Bronze Age of Comic Books). Note that this is the period that spawned the Adam West Batman series and the Superman Broadway musical, and no, this is not a coincidence.