精せい神しん年ねん齢れい

noun

mental age

Refers to a person's level of mental development or maturity, often contrasted with their actual chronological age.

• 彼かれの精せい神しん年ねん齢れいは実じつ年ねん齢れいよりずっと低ひくい。

  His mental age is much lower than his actual age.

• 精せい神しん年ねん齢れいを測はかるテストを受うけた。

  I took a test to measure my mental age.