2. Confucius said: "At the age of fifteen, I am interested in establishing an academic system; At the age of thirty, I can establish the prototype of my own academic system; At the age of forty, I can fill the gap in my academic system; By the age of 50, I know my academic system is so natural.
3. Standing at the age of 30: When people reach the age of 30, they should determine their own life goals and development direction.
4. Fifty know life: When people reach the age of fifty, they have to accept their fate, which is irresistible.
5, sixty flowers: 60 in the lunar calendar, always reincarnation, people must recognize the old.