You make a very good point. Its not clear if the parents above have stated that their reasons are simply the age difference or if there is something more to it.

I was in a similar situation when I was a teenager but the age difference was 9 years. My mom said the age difference was the issue but after a ton of talking (mostly because I was too smart to listen) the real reasons came to light. My mom saw them as related to the age difference but, that didn't come across in her words.

Looking back now, I can honestly say she was right in everything she was worried about but, I wouldn't consider any of the things she took issue with to be strictly related to age difference. She was really more concerned with the level of irresponsibility that the woman was exhibiting, and it cost me a car and a bankruptcy in the long run. Maybe, had my mom said that in the beginning I would have listed... but I was a teenager, so probably not.