Lots of good advice from the gallery here...on both sides of the argument. But we are the spectators; you're the player here. Only you can make the moves
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I am curious though - did you post here to get help to talk yourself out of this blossoming relationship OR into it? From your posts I don't think you're sure yet...so keep cruising for a while yet with this great friendship you obviously have.
If you have doubts then don't make the leap. If you dispel those doubts in your own mind (and you know she has no doubts either) then frankly nothing else matters. Not age, not race, not religion, not anything. We are here for a good time, not a long one. Opportunities for real love are rare...don't waste your life wondering "what if".