Is age an issue? 18 year old girl wants a 22 year old guy?

ishimernshine
I am an 18 year old girl about to graduate high school. I started volunteering ever week at this soup kitchen run by the local university students to find a new crowd as I'm kinda done with high school. There's a guy there who is 22 that I like, and who is really friendly with me (and everyone else mind you). We've already hung out once before (after volunteering I asked him for a coffee, he paid for me). After talking I feel like we have a lot in common, and he opened up to me about his past, etc. I feel like we are a good match, but I'm wondering why he isn't picking up on my signals? I'm attractive, caring, and a good listener. Is it wrong someone who just graduated high school to date someone who just graduated university?
Updates
+1 y
I volunteered with him yesturday,and afterward he asked me out for a coffee!We spent 2 1/2 hours in the coffee shop,connecting over really deep topics like what life means to us,etc.Afterwards I casually asked him if he was seeing anyone,and he said "no, the girlfriends in my past have all been crazy and have messed me up...I'm trying to recover".Now I know that was an obvious hint,but I went there anyways, and told him I'm available and not crazy. He said he "didn't think it's a good idea"! :(
Is age an issue? 18 year old girl wants a 22 year old guy?
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