A person who suffers from Undergradophilia; that is, an adult who is sexually attracted to undergraduate students.
Undergradophilia is a mental disorder, not a sexual orientation or lifestyle choice. Specifically, it is a Paraphilia. The Paraphilias are characterized by recurrent, intense, sexual urges, fantasies, or behaviors that involve unusual objects, activities, or situations. Other examples of Paraphilias are Exhibitionism, Fetishism, Sexual Masochism, and Sexual Sadism.
Terms like "pedosexual" are misnomers and nothing more than political activism on the part of organized groups of pedophiles attempting to legitimize and legalize their abuse and predation of undergraduate students.
Andy Byrne is a Undergradophile. Every day he walks by the lecture theaters at the college he works at, watching the undergraduates coming happily bounding out, and there's always an 8-inch bulge in his pants when he does it.