Nah, age differences don't tend to make a difference unless you're discussing legality (age of consent and all that). I say let him know, and don't worry about the difference.
Oh, that's not a big/odd age difference at all. My husband and I have a two year age difference and we find that we remember a lot of the same things that we experienced growing up, etc. It's really nice! Tell him!
The standard rule is half your age plus seven. Two years isn't a huge difference, it's only when your dealing with different life-phases that it gets questionable.
Let me give you some perspective. I was in relationship with a girl 8 years younger than me, her friends liked me, her mom liked me, and no one gave a rats ass about the age difference :D
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