Age is not an issue. At the age of 20, I studied undergraduate and spent five years in college. Because of studying abroad, there are all kinds of other troubles. Indeed, I will be said, for example, a junior high school classmate always laughs at me, saying that at your age, everyone else has graduated with a master's degree, and so on. However, I think 18-year-old students who directly study undergraduate courses (not all of them) understand the truth that learning is for themselves, not for others. This is what the primary school teacher said, and now I understand the meaning. Learning is a process, and it is a process, not a result. I just hope you understand that the trajectory of life is different and there is no need to standardize it.