When is too late to learn a language? (Adults can't learn a language?) [polyglot]

I have heard that it is too late to learn a language after you become an adult and I have thought that it is untrue. However, it is obvious that a lot of adults tend to fail to learn a language while people who have learned a language since they were a kid tend to succeed in learning a language. In this video, I am telling my opinion about this topic and I want to listen to your thought!

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Hello. I am Jusung Kim from South Korea.
I learn English, Spanish and Chinese.
I teach Korean language.
I am interested in Digital Marketing.

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