The wrong thing here is that, the man is too old for girl. as a young girl, she has to go through such as education, before getting married, the old man can be girls' father, so why should the man go in for young girl instead of marrying an old woman. This girl can go in for a man who would be ready to take of her,
Answer
I don't think there's anything wrong with it if they are dating each for the right reasons and not using each other.
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