The only guys that ever approach me are older men. Why is that?

I'm 19, turning 20, and since I was about 16, I've only been hit on or approached by older guys. If I was 16, a 36-year-old would find me attractive, and when they figured out my age they would back off and be surprised at how young I am. My whole teenage life I dealt with that. With that being said, I never got approached from guys my own age and that was concerning for me. I'm in college now and I get approached by older men now. They are surprised that I'm younger. Most of the time I would ask them "What makes it seem like I'm older?" and it's always "how you carry yourself" "you look mature" and "you sound mature". Why is that?

The only guys that ever approach me are older men. Why is that?
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