Do you still want to learn a new language in your twenties?

I am 30 years old, and I am considering learning a new language. English, French, and German were my working languages ??for the past ten years. These have maintenance costs. Now hesitant in Arabic, Japanese, Spanish. These languages ??have greater advantages for Chinese people. According to the current changes in the world situation, these languages ????will further become mainstream. Africa will be the market that the world will compete for in the future, and French and Arabic are the two main languages ??in Africa. Spanish is similar. Native speakers of French, Spanish, and Arabic have poor English, and English is not a strong substitute for these languages. Which language to choose is a relatively big topic. This discussion is only oriented towards career development: (A comprehensive and multi-angle discussion is here: If you want to train a second language for your children, which one is better for Spanish and French?) Twenty-seven or eight What is the difference between learning a new language at age 20 and learning a new language at age 20? The degradation of learning ability and memory is secondary. The key is that you are a social person and cannot be as idealistic as a student. If you are in your early 20s and say you want to learn N languages, you should like it. If you are almost 30, the tangled question should be: Are you married? Is there anyone? Have you bought an RV? How about a loan? How much money do you make? And these are the real obstacles to foreign language learning. If you don’t have enough money, you don’t have to worry about food, rice, oil and salt, or if you are excellent and have enough energy to study. I don't recommend learning a new language. Because from a career perspective, English is rarely used in the Chinese labor market. Except for full-time translations, there are too few situations where other languages ??are used, and this will not change in the short term. Regardless of career orientation, just from the perspective of personal quality improvement, any intensive learning of a language with less than 500 hours is difficult to achieve. In other words, if you want to read news on a website, it may be difficult. Not to mention watching movies, reading, and communicating with foreigners. Why am I hesitant about these three languages? Regarding Japanese, I learned it many years ago. It is purely a personal hobby and has nothing to do with career development. And I believe that even if Japan withdraws its investment in China, Sino-Japanese exchanges will still exceed those of other countries. Regarding Spanish and French: From a practical perspective, China will adopt a great power strategy for a long time to come, seizing resources and markets from the former colonies of France and Spain, and more immigrants from North Africa and Latin America will enter China. In China, there will be more and more foreigners speaking these two languages, which can be said to be a potential market. Moreover, the respondent is in France, where there are many Arabs, and I can make effective use of this condition.