There are many such cycles, noted even in the western world. New marriages must get past the seven year itch, and youngsters reach the age of reason at the age of seven, and the major phases through adulthood have even been noted to fall into such seven year cycles. It is indeed, as societies have a type of life, reflecting as they do the many lives of their members - somber years of marketing retraction followed by adventurous rebellion, years of caution followed by playful extravagance. In the west, such cycles are termed economic boom times or depression, conservative repression or high-flying extravagance such as the roaring twenties. The Chinese cycles were developed when the factors influencing societies moods were limited, and thus had more influence, where the more free wheeling west has more factors influencing its cycles.
Horoscopes thus are all very down to Earth.