The fact that a young child who experiences brain trauma as a young child is more likely to recover language skills than an older adult who experiences the same type of brain trauma may be due to:

Neural Plasticity

Explanation:

According to my research on studies conducted by medical professionals, I can say that based on the information provided within the question this may be due to Neural Plasticity. This is the ability of the brain to change continuously throughout an individual's life. A child has a continuously developing neural plasticity, while an adults is already developed and barely changing.

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