The fact that a child will generally have great difficulty learning a language if he is first exposed to it after puberty is generally taken as evidence that language has a sensitive period.

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This is because the concept of a sensitive period in language acquisition suggests that there is an optimal window for learning language, and after this period, language acquisition becomes significantly more difficult, which is observed in cases where children are exposed to language after puberty.

The Fact That a Child Will Generally Have Great Difficulty