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Most guys tend to find younger women more attractive, because women at that age are more fertile. Men are designed to be attracted to the physical traits of a fertile woman. As to whether or not they want to be in a relationship them is another story.
Most guys in their 30's are at a different point in their lives. A woman that much younger is typically going to get on his nerves. Society also wants to shame guys that openly admit to liking younger women. So even if a guy did want to date such a young women, he may not want to admit to it.
I would say that it is very common of guys to be attracted to girls that age. Even women find younger women to be more beautiful. In fact a lot of the "women" used to sell anti wrinkle cream to other women are actually just 14 year old girls that look older than their real age. That is the real reason why their skin always looks so youthful in those pictures.
I would advise people not to date someone much older, or much younger than themselves, unless they are just looking for something physical, and short term. Those relationships tend to have all sorts of problems, and the risk of one or both people getting hurt skyrockets.2THIS IS NOT RELEVANT ANYMORE