YOU SAID:
haven't seen you in a long time old chap
INTO JAPANESE
昔のチャップであなたに会っていません
BACK INTO ENGLISH
I haven't seen you in the old chap
INTO JAPANESE
私は古いチャップであなたを見ていません
BACK INTO ENGLISH
I haven't seen you in the old chap
That didn't even make that much sense in English.