Years such as 1923, 1935, 1947, 1959, 1971, 1983, 1995, 2007, as well as the upcoming 2019 and 2031 are all considered zodiac years for the Pig.
The term "zodiac year" refers to the lunar year corresponding to one's birth sign, also known as the birth sign year. For example, if someone was born in the Year of the Pig in 2007 (calculated by the lunar calendar), then 2019 (also the Year of the Pig) is called their zodiac year.

Actually, the concept of the "zodiac year" dates back to the Western Han Dynasty. It mainly originated from the Chinese twelve animal signs and the "reverence for red" psychology. In ancient China, people used combinations of the ten heavenly stems and twelve earthly branches to record the years of birth. To make it easier to remember and calculate, people used twelve animals such as the rat and ox to correspond with the twelve earthly branches. Each year was represented by one of these animals as the sign of that year. The zodiac year for the Han nationality is calculated based on the cycle of the twelve animal signs. It is closely related to the twelve animal signs. The year of one's birth is the lunar year of a certain animal, and every time that animal appears again, it becomes the person's zodiac year. Because of the cyclical nature of the twelve animal signs, every 12 years, people will encounter their zodiac year, and thus, the zodiac years in life are 12 years old, 24 years old, 36 years old, 48 years old, 60 years old, and so on. Many ethnic groups in China have the custom of valuing the 60th birthday of the elderly, known as "Flower Age." Flower Age is the sixth zodiac year in a person's life, and also marks a cycle in the stem-branch calendar system. It needs to be celebrated well, expressing people's wishes for longevity, health, and good luck.