Where does “iuvenior” come from?

iuvenior (Latin) comes from Latin iuvenis, from Proto-Italic *juwō.

iuvenior (Latin): younger, more youthful

Definitions

Step	Language	Word	Meaning
1	Latin	iuvenis	young; A youth, a young man, young woman, young...
2	Proto-Italic	*juwō	—

iuvenior — Etymology, Origin & Word History | Etymology Explorer