I never actively look for it, but I seem to always end up talking to guys that are quite a bit older than I am.
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At your current age I find it a bit of a stretch only for the fact that you're just 18. You are just now beginning to embark on your life, perhaps by starting college or work. There are still so many things you still have yet to discover about yourself, what you want in life, and about life in general.
The guy approaching his 30's, assuming he's 28, has been able to grow to the point where he may have gained all the answers to those questions, and perhaps is looking to settle down. He has most likely finished all of his educational endeavors, perhaps started his career path, dated and realize what he wants in a partner and is looking to settle down.
You on the other hand is beginning to come of age where you are beginning to date and find these answers. You may have a general idea of what you want, but you still lack the experience in determining if the guy you are dating is really the one that is right for you. It's one thing to be intellectually mature but another to be experienced.
I really don't think it would be a wise idea to date someone ten years older at this point in your life, but if you should choose to do so, understand that while you are just looking to date and see how life is in the dating world, he is most likely looking to settle down (something you most likely aren't ready to do at your age.)
I'm not saying that 10 years age different is large, just too large at your present age. Once you get a little older and get more experienced in what you want and how to better evaluate how others measure up then of course you can expand your age difference preferences.
Perhaps once you reach the age of 28 then if you choose to date a guy that happens to be 38, then it would be a lot more compatibility in terms of where you both are in your lives and where you want to go, but at this point in your life, I find ten years a bit too much.2