I think it depends on the man and how he acts. If he is creepy then yes he would be a dirty old man; if he is nice and respectful man then no.
Although I do find it creepy when seeing a young girl (like 18) dressed slutty hanging off an old man's arm while he ogles her.
So, to answer your question I think it depends on the man's characteristics if he is considered a dirty old man!
-wendi
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