Flirting

What does it mean if a guy says "you look 'older' than the rest of us"?

Today a guy randomly approached me in one of my classes, and told me the most random thing I've ever heard...he asked me when I had graduated high school told me that I look older than my age, in a good way...

How would you take that comment?
What does it mean if a guy says "you look 'older' than the rest of us"?
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