During what time period is the novel, This Stranger, My Father, set?

The current time of the story is twenty years after the 1960s when John F. Kennedy was President of the United States, haircuts were short, and the Beatles were just another English group trying to make the big time. . . . Missiles were new. . . The first Minutemen were being constructed in Montana and the Dakotas and the Russians had nothing to compare with them.