Is a 4 year age difference to much?

So Im 21 and I've had younger girls 17 usually try to ask me out several times. I've never actually dated any of them I usually just dubbed them. But I've considered it depending on the girl if I'm being honest. The legal age of consent where I live is 17 but it still makes me uneasy to even consider it. When me and the girl have a great deal in common and have potential to be in a relationship makes it even harder. Am I wrong for thinking like this, if I do find a girl I actually really like and she's that young should I give her a chance? I'd like some thoughts and opinions?
Is a 4 year age difference to much?
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