Dictionary / Vocabulary / いい年して
いいとしして
(in spite of) being old enough to know better
Also written いい歳して、いい齢して
いい年してそんな馬鹿なまねはよせ。
At your age you should know better.
いい年してラノベ読んでる奴って普通に知恵遅れの障害者だろうな。
Normally, a guy who reads light novels despite not being a kid anymore is a retard, don't you think?
いい年して、再婚しようとか本気で思ってるの？
Are you seriously thinking about getting married again at your age?