Is a 15 yr age gap a big deal when it comes to the woman being older?

Me 38 and him 23. Is there attraction? Yes. But I'm too scared to try. We haven't done anything. Not even kiss. I refuse. And he won't give up. I know I don't look my age. Every person ever guesses me 10 years younger than what I am. And he acts very mature. I've always dated older men and it never works out. My friend told me that I should date younger. How much "younger" is appropriate? I feel like it shouldn't be more than a 10 years gap. So what do I do about him? I read that there is some formula for age gap. Half your age plus seven. Which means at this point a 12 year gap is acceptable by societies standards. Do you agree? What's your opinion about how I should handle him, and what is an acceptable gap?

Is a 15 yr age gap a big deal when it comes to the woman being older?
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