全称“智力年龄”。是相对于实际年龄（生理年龄）而说的。这个术语由比奈首先提出并采用。是指在智力测验量表上与某一智力标准水平相当的年龄mental age

• 保教人员的测试结果是：平均智龄7个月，智龄发育商仅81分。

  The result of the tests on those being cared for and educated showed that the average mental age was 7 months, and the mental age development quotient was only 81.

• “邻舍辅导会智龄专上学院”的代表队

  delegation of the "neighbourhood guiding committee mental age post-secondary school"