If an old dog barks, he gives advice. This is a famous saying of China that has been circulating for many years. But is this really the case? Old people walk more roads, see more things, suffer more losses and experience more than we do. We will always be a continuation from generation to generation. If we follow the first-come-first-served order, then we really should agree with this sentence. And the advice given by many old people can really make us take fewer detours. Nothing is absolute, but this sentence is not necessarily all right. In my generation, many parents are illiterate farmers and workers. Their understanding of the world lags far behind the development of the world. The truth they thought before may no longer be applicable or even usable at this time. For example, when we were young, our parents taught us to be honest, obedient and quiet. In fact, these are not necessarily good things for the formation of a child's character. For another example, our parents let us study math and physics well, and we are not afraid to travel all over the world. I don't know that the most popular people nowadays are not engineers, and they may not be able to travel all over the world just by looking at mathematics and physics. There are also parents who want us to only read the books well and give up the others. These are all because they are limited by their own cognition, which leads to inaccurate judgment of future events. On the other hand, it is no wonder that their society has developed too fast, and people's values and world outlook have undergone tremendous changes. What used to be true is not true now. If you don't listen to the old man, you may not suffer. Not all old people are wise. Learning to analyze by yourself is the most valuable.