you are grown up
Wenn du erwachsen bist, wirst du's verstehen.
When you're older, you'll understand.
— Audition (2000)
Jetzt, da du erwachsen bist, ist es an dir zu entscheiden, was du tun willst.
Now that you're an adult, it's up to you to decide what you want to do.
Was willst du tun, wenn du erwachsen bist?
What do you want to do when you grow up?