Why won’t he date me now?

This guy that I’ve had a crush on for a bit. I told him last night how I felt and asked if he would date me. He told me no, mainly because he thinks I’m too young, but told me that I’m a great person, attractive, and gave me some good advice. Now what he did say to me was to set my bars and don’t settle, and see what’s out there. And if in a years time we’re both still single and I’m still someone you see yourself with, then we can talk. Why would he consider dating me then but not now?
Why won’t he date me now?
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