when i'm 24 i'll only have been working in my field for 1.5 years, if i'm employed directly after my internship. I might be in grad school and i will have dreams to travel or explore my own identity before i "settle down". I would hope that by 37 i wouldn't have much in common with that 24 yr old me. It's very possible that he sees you as naive, vulnerable, or weak and is taking advantage of that