いい年とし

expression, noun

mature age; advanced age

Refers to being of an age where one is expected to act responsibly; often used in the phrase いい年をして to criticize childish behavior.

• いい年としをして、そんなことで泣なくなよ。

  Don't cry over something like that at your age.

• 彼かれはもういい年としなのに、まだ親おやに頼たよっている。

  He's already old enough to know better, but he still depends on his parents.

expression, noun

age when one is old enough to know better

Specifically the age at which one should be mature; almost always used in the set phrase いい年をして to scold or express disbelief at someone's immaturity.

See also: いい年をして

• いい年としをして、そんな嘘うそをつくものじゃない。

  You shouldn't tell lies like that at your age.