He said I am too young for him..what does he mean?

Anonymous
long story short I have been bumping into him for past 4 years at parties and events.. he went to school with my brother he doesn't know me at all. So recently I found his number in my brothers phone and I texted him as a "prank" making up a fake name etc. I really like this guy he has a good personality as well as looks of course.. anyways so after 3 weeks of talking he really wanted to know who I was so I told him the truth he added me on Facebook and he said I was too young for him..he is 28 and I am 23..he said at my age he had many crushes too. He is giving his step exams this month so I asked him if we are done here..and to that he replied saying I am busy preparing for my exams so if I don't message you don't think I am ignoring you..i don't know what he meant by all that..first he said I am too young and when I said if we are done he said that..what do you guys think? what should I do? I haven't heard from him since then..yday I sent him a funny video all he wrote to me was "lol" and I asked him hows everything with him..he never replied back..what should I do now?
He said I am too young for him..what does he mean?
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