Why do young guys at my college keep hitting on me?

I'm 34 and I keep getting propositioned by these 20-22 year olds. I was supposed to meet with a study 'group' on Saturday...but it was just one guy. He wound up discussing his ual experiences with me and kissed me on the cheek after trying to pry personal info from me. Another wanted to help me study too. I almost said yes, but he started 'going there' as well. I don't dress provocatively and I'm pretty quiet. Why do men seem to think I'm 'hot to trot'? Should I just ume they all just want to bang the older chick at school?