在你這個年紀你應該要更懂事。
You ought to know better at your age.
Meaning
to grow beyond the naivete of childhood; to be aware of what is going on in the world
(esp. of a child) sensible; thoughtful; intelligent
Examples
在你這個年紀你應該要更懂事。
You ought to know better at your age.
他已經長大該懂事了。
He is old enough to know better.
她年紀夠大該懂事了。
She is old enough to know better.
我觉得你是时候该懂事了。
我覺得你是時候該懂事了。
I think it's time for you to grow up.