What was the rite of passage in ancient Rome whereby a boy is transformed from aN ephebe to a man?

http://www.boyhoodstudies.com/encyclopaideia.htm

"Toga Virilis" according to this site.

also called "toga libera" and "toga pura") coming of age ritual, toga praetexta is exchanged for the toga virilis. "The occasion was celebrated with great rejoicings by the friends of the youth, who attended him in a solemn procession to the Forum and Capitol (Valer. Max. v.4 §4). This assumption of the toga virilis was called tirocinium fori, as being the young man's introduction to public life, and the solemnities attending it are called by Pliny (Epist. i.9) officium togae virilis, and by Tertullian (de Idolol. c16) solemnitates togae. The public ceremonies, connected with the assumption of the toga virilis by the sons of the emperors, are referred to by Suetonius (Oct. 26, Tib. 54, Cal. 16, Ner. 7). The toga virilis is called libera by Ovid (Fasti, iii.771). Girls wore the praetexta till their marriage."

"Ephebos" was, of course, a Greek word, not Latin.

By the way, "ephebos" referred to an adoescent, not a child. The Latin word for "boy" is "puer."




https://en.wikipedia.org/wiki/Ephebos