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

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This statement reflects the critical period hypothesis in language acquisition, suggesting there's a specific time frame during which language learning occurs most naturally and efficiently. After this period, typically identified as ending around puberty, acquiring a new language becomes significantly more challenging.

The Fact That a Child Will Generally Have Great Difficulty