How likely is for a guy in his early/mid 20s be interested in a girl who just graduated highschool?

I'm a senior in highschool and I wanted yo have a serious relationship but I figured guys my age are just not prepared for it and lack maturity in many ways.
I want to look for older guys once I graduate, I know that most of my college classmates will be older anyways, but I don't know if they wouls be interested specially considering not only I am young but I look even younger.
So? Would they? Also, would you consider men in that age range more prepared for a serious relationship than one some years younger?
How likely is for a guy in his early/mid 20s be interested in a girl who just graduated highschool?
Post Opinion