Subst. comm., one who is in the flower of his or her age (mostly of persons older than adolescentes and younger than seniores, i. e. between twenty and forty years), a young person, a young man, a young woman .

http://lila-erc.eu/data/lexicalResources/LewisShort/id/LexicalSense/n25441.2_iuuenis an entity of type: LexicalSense

Subst. comm., one who is in the flower of his or her age (mostly of persons older than adolescentes and younger than seniores, i. e. between twenty and forty years), a young person, a young man, a young woman . 
Subst. comm., one who is in the flower of his or her age (mostly of persons older than adolescentes and younger than seniores, i. e. between twenty and forty years), a young person, a young man, a young woman . 

data from the linked data cloud