Amy Merrick writing for The New Yorker’s Currency blog:

By choosing the eighties, marketers are taking advantage of what we know about when people experience nostalgia. As people enter their fifties and begin to take stock of their lives, they become more susceptible to nostalgia, according to Erica Hepper, a psychologist at the University of Surrey and a leading researcher on the subject. Because we tend to form lifelong preferences in our early twenties, adults in their fifties are now nostalgic for the nineteen-eighties—the time when their lives seemed full of promise and their tape decks were blaring heavy-metal bands. That thirty-year retrospective glance might explain the popularity of “Back to the Future,” a 1985 movie set in the nineteen-fifties, or why “That ’70s Show” was a television hit in the early aughts. (Adam Gopnik has written about a similar cycle, which he calls the Golden Forty-Year Rule.)