I think it depends, because computer technology is changing very fast now, and various languages are emerging one after another. For example, if you are proficient in a language now, but you don't make progress in your work and don't learn a new language, then I think you will definitely be dismissed by the company in the future, because the language you used to know will definitely be eliminated, and the company boss needs you to program in a new language.

On the other hand, if you are a diligent person, you have been learning all kinds of knowledge since you started working, and you know the most popular languages like the back of your hand. If you have this ability, I believe you will not be eliminated at any time, not for other reasons, because the company is short of people like you, and old people like this are also very experienced. Once you encounter any bug, you can quickly find the problem, which can be said to be more convenient than novice use.

And when the company recruits interns every year, it can also send you to give them counseling and training, which can also save the company a lot of money.

But then again, the corporate culture advocated by many Internet companies is young, and they are more willing to find fresh graduates, because in the eyes of company leaders, only when employees are young enough can they have the energy to work overtime, and the company's vitality will become more vigorous. After all, the Internet is a career of eating youth, so all friends who are programmers should cherish it.

If you can't do what I said above, then you must think about your future, or you will be unemployed when you are in your forties.