Suízhe niánlíng zēngzhǎng, tā de rènzhī shuǐpíng yě zài tígāo.
As he grows older, his cognitive level improves.
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usage
认知 is often used in formal or academic contexts. Common collocations include 认知能力 (cognitive ability), 认知水平 (cognitive level), and 认知障碍 (cognitive impairment).