New Year’s observances blend recollections of the past, celebrations in the present, and anticipation of the future. For a variety of reasons, I’m feeling nostalgic this year. I’ve been giving a lot of thought to the decade of my childhood—the 1950s.In October, my wife and I saw a play in which people weary of the hectic pace of contemporary life could escape to an “authentic” 1950s community where the more relaxed pace of the past had been recreated. In the play, the benefit of relocating to the ’50s was a simpler, less stressful life, but it came at a price—enduring...