YOU SAID:
Your face has become old, yet you haven’t grown up
INTO JAPANESE
あなたの顔は古くなっていますが、まだ成長していません
BACK INTO ENGLISH
Your face is old, but not yet grown
INTO JAPANESE
あなたの顔は古いですが、まだ成長していません
BACK INTO ENGLISH
Your face is old, but not yet grown
That didn't even make that much sense in English.