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IMO one of the most prominent reasons - and one that I never see mentioned - that learning a language as an adult is more difficult is that the older you are, the more socially-unacceptable it becomes to point out grammatical and vocabulary errors. When you're a child, elders correcting you is so natural it scarcely even breaks the flow of conversation: child: "Me and Tim went -" adult: "Tim and I went." child: "{pause} Tim and I went..." As an adult, you simply do not get this kind of feedback. There's no chance in hell I would interrupt another adult to make the above correction. It's simply too disrespectful. And yet it is precisely this disrespectful interruption and correction that enables children to have tight feedback loops which result in fast, effective learning. |
Rather, the biggest showstopper is that adults tend to always be busy, and fall back to their native languages to get the busy stuff done, and only end up practicing their new language during positive interactions when they have time. Which is really only a very small fraction of their life.
For example, I routinely see people in cross-cultural relationships try to learn each others' languages but fail miserably at learning when they get into disagreements and have that disagreement in English instead of the language either person is trying to learn. And thus, they don't learn. In order to truly learn a language to native fluency you need to be forced to use it for every common life situation, not just the occasional positive interactions. Children are more or less forced to be using the new language 100% of the time.