Infants, children, teens and adults can acquire the foreign language. And not only learn it.
In order to acquire the language it is necessary to listen and read massively.
A time arrives when you don’t care too much if you’ve got to read or listen something in English. Your mind has adapted itself to the language.
I repeat, also adults can still acquire the language. I see that in my students: they are kind of thinking in English, most of them, and I see it because of the answers and responses in English they give me. / Photo from: languages sg