avoir grandi, avoir mûri, adulte
Don't know what she has grown up to be.
Je ne sais pas ce qu’elle est devenue en grandissant.
— Piku (2015)
It hasn't grown up and come out of its shell yet.
Il n’a pas encore grandi ni quitté sa coquille.
— Shoplifters (2018)
Now that you're grown up, you must not behave like that.
Maintenant que tu es adulte, tu ne dois pas te comporter comme ça.