Before the internet everything happened in periods of seven years. All the cells in your body would be replaced, your luck would recover from a broken mirror,

Before the internet everything happened in periods of seven years. All the cells in your body would be replaced, your luck would recover from a broken mirror, the bankers would discharge your debt, and missing people would finally be declared dead. It was a much more elegant system than we have today. Edit: And of course, the seven year itch.