There's nothing wrong with this - just as there are women who fancy younger men, there are women who fancy older men - my last boyfriend was 19 years older than me. However, it's all down to attitude and take on life. Some men can be young in their attitudes, but some older men can act years older. One big issue I would consider is the likelihood of giving you children. Many older men may well have been in long previous relationships, and may have grown up children, or have had several children already - which means they might have had a vasectomy, or may not wish to ever have more children. Women having relationships must consider this a possibility if they want children of their own - but equally, a man considering a relationship with a younger woman must consider that if she is childless, she may well want children in the immediate future - an option that must be realistically considered!!
Weigh up your options carefully.