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1. Oxford American Dictionary

   mental age

   • IPA[ˈmen(t)l āj]

   美式

   • n.
     a person's mental ability expressed as the age at which an average person reaches the same ability

   • noun: mental age, plural noun: mental ages

2. • 釋義

   n.

   名詞

   • 1. a person's mental ability expressed as the age at which an average person reaches the same ability she was 65 but had a mental age of two