Midrasch zu Wajikra 21:13

7) (Vayikra 21:13) ("And he, a woman in her virginity he shall take"): "He" (the high-priest), and not the king (is under the interdict); "he" and not the Nazirite, (though they, too, are "crowned"): "he," to include (in the interdict) the Cohein anointed for war. "a woman in her virginity he shall take": excluding a bogereth (a maid after twelve and a half years), whose (signs of) virginity have diminished. R. Eliezer and R. Shimon permit a bogereth.