How old a person is should not be absolute. Confucius said: I have five out of ten, but I am determined to learn, standing at thirty, not confused at forty, knowing my destiny at fifty, listening to my ears at sixty, and doing what I want at seventy, not exceeding the rules. I think people should be mature by the age of 30, but it doesn't rule out precocity and late bloomer. Qin Ganluo worshipped twelve times, and Jiang Ziya worshipped eighty times. Life is so wonderful. Some people get ahead early, while others are mediocre until they are old. But opportunities will only come to those who are prepared. I think qualitative means that people can understand their own strengths and weaknesses, make plans for their own lives, and work hard towards their own goals, then it is qualitative.
I don't know, man. Are you satisfied?