behave in a manner appropriate to your age
自分の年齢にふさわしい行動をする (jibun no nenrei ni fusawashii kodo o suru)
"Stop being so childish and act your age!"
"そんな子供っぽいことをやめて、年相応に振る舞いなさい！" (sonna kodomoppoi koto o yamete toshisoo ni furumainasai)
to gradually work on something to achieve a result
to control or influence someone or something secretly
too surprising or shocking to believe
A peaceful time before trouble or chaos starts.
the most important point; the final result or profit
said when someone appears just as you mention them
