Ephebus, ephébi, m. g. penult. prod. Terent.A stripling of xv. yeares of age.Crinitus ephebus. Claud. Teneri ephebi.Stat. Greges epheborum. Cic.
Lewis and Short: Latin dictionary
ĕphēbus, i (gen. plur. contr. ephebūm, Stat. Th. 4, 232), m., = e)/fhbos, a male Greek youth from 18 to 20 years of age (cf.: puer, adolescens, juvenis, adultus, pubes), Ter. Eun. 5, 1, 8; Cic. Fl. 21, 51; id. N. D. 1, 28, 79; Suet. Aug. 98; id. Ner. 12; Hor. Ep. 2, 1, 171; Ov. A. A. 1, 147 al.: is postquam excessit ex ephebis (after the Gr. e)celqei=n e)c e)fh/bwn), i. e. after he had come to the age of manhood, Ter. And. 1, 1, 24 Ruhnk. (also cited in Cic. de Or. 2, 80, 327).