The Grand Luck starts in May five years after birth is a method of predicting the future. It refers to counting from the moment a person is born, and calculating each person's future every five years as a stage. Possible life transitions and important events.
In fortune telling, one’s fortune is usually calculated based on a person’s birth date (that is, the stems and branches composed of the year, month, day, and hour of birth). The so-called "Great Luck" refers to the luck of each stage a person goes through in his life, such as the status or fortune of different stages such as childhood, youth, adulthood, old age, etc.
Therefore, the great fortune starting from May five years after birth means that starting from the fifth year after a person is born (i.e. five years old), the great fortune of a person's life will be calculated every five years.