Thirty-year-old idiom information

Interpretation: It means that when a person reaches the age of 30, he must be independent in personality, knowledge and career. Now it has become a synonym for people in their thirties, used for men.

Source: "The Analects of Confucius is a government": "I am determined to learn five out of ten, stand at thirty, not be confused at forty, know my destiny at fifty, listen to my ears at sixty, and do what I want at seventy, without exceeding the moment.

Interpretation: I am fifteen years old and interested in learning; At the age of thirty, I was sure of everything I said and did. Forty years old, (mastered all kinds of knowledge,) not confused; At the age of fifty, I knew my destiny; At the age of 60, when you listen to others, you can distinguish between true and false and judge right and wrong; At the age of seventy, you can do whatever you want, and any idea will not go beyond the rules.

For example, in his thirties, Goethe studied harder, so he later created many works.

References:

Baidu encyclopedia-thirty years old