ephebus
noun
ephe·bus i-ˈfē-bəs 
e-
plural ephebi i-ˈfē-ˌbī
e-
: a youth of ancient Greece
especially : an Athenian 18 or 19 years old in training for full citizenship
Word History
Etymology
Latin, from Greek ephēbos, from epi- + hēbē youth, puberty
First Known Use
1627, in the meaning defined above