So... I'm 19 & he's 23. Is there too big an age difference?

There's this guy at my church, he's in the Audio/Visual department and I work in Youth Ministry. I used to work in A/V, and my old partner introduced me to 23 year old Justin. Ever since then, Justin and I say hi to each other every day, and now we are starting to build more conversation. He even introduced himself to my mom and sister. He's always watching me as I work with the kids, and will occasionally tell me that he thinks I should be in charge. I have definitely caught his eye, and he has mine. The only thing is the age difference. He's 23, and I'll be 19 the first week in January. Is it age difference too big?
Yes, 4 years is a lot
No, there age difference is fine
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So... I'm 19 & he's 23. Is there too big an age difference?
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