Is it wrong for a 19 year old man and a 23 year old woman to date?

So I met a man who is just everything I've always wanted and then some. He's sweet, motivated, accepts me and my son and makes me so happy. He has such an old son and acts more mature than a lot of men I have talked to. My sister is telling me I shouldn't be with him because he's young but I can't help but fall for him. Am I wrong for being 23 and dating a 19 year old?

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