The thirty-year-old refers to the age of 3, and the well-known thirty-year-old means that you should be able to stand on your own feet and achieve something by the age of 3. In fact, the year of standing is a title used by the ancients to express age. In addition, there are other titles, such as the year of weak crown, the year of no doubt, the year of knowing right and wrong, and the year of sixty, which respectively represent the age of 2, 4, 5 and 6.

The age of 3 refers to the age of 3

, and the age of 3 refers to the age of 3. Many people are familiar with the saying, "Stand at 3, don't be confused at 4, and know your destiny at 5", in which standing at 3 means that you can stand on your own feet and achieve something at 3.

"Standing at 3" comes from the words of Confucius in The Analects of Confucius. Confucius believes that men should achieve something at the age of 3, and at the same time they can have a foothold in this world. Therefore, 3 years old also means that they need to bear some responsibilities by themselves.

The ancients generally did not use specific numbers to represent age, but used age-related names to represent it. For example, 2 is the year of weak crown, 4 is the year of no doubt, 5 is the year of knowing right and wrong, and 6 is the year of sixty.