Prez is the title of two DC Comics about teenage presidents. The first debuted in his own short-lived title written by Joe Simon and drawn by Jerry Grandenetti in 1973. The series is predicated on the notion of a Constitutional amendment lowering the age for eligibility for office (which may have been inspired by the 1968 film Wild in the Streets). The upshot is a teenager gets elected, and who better than a earnest and idealistic kid from Middle America whose mother even named him “Prez” ‘cause she thought he’d be President one day?
Finally, because you (or somebody) demanded it, The Prez has been collected. This collection includes the four issues of The Prez's run, an unpublished story from Cancelled Comics Cavalcade #2, and a continuity-twisting tale from Supergirl #10. Neil Gaiman brought Prez out of comics limbo in Sandman #54 in 1993. This led a sort of follow-up in Vertigo Vision: Prez. Miller and Morrison also used the Prez in Dark Knight Strikes Again #2 and the Multiversity Guidebook. All of these deuterocanonical texts are included, as well.
In 2015, an all-new, all-different Prez is introduced. This is Beth Ross, an Oregon teen who's elected via Twitter in 2036. The series by writer Mark Russell and artist Ben Caldwell. It only lasted 12 issues, but it was fun while it lasted, providing a modern update to the concept.