Underage, youthful, inexperienced to name a few. The context of the usage would have to be known. Some more that may be helpful-baby, child, novice, newbie, or new.
Brood
miss, missy, young lady, young woman, fille,
Some synonyms for the name Tarun could be young, youthful, or adolescent.
Youth, baby-face, child
Synonyms for early (before a scheduled time) include oversoon or premature. Synonyms for early (first stages) include initial, new, primal, preliminary, or young.
The word childish could mean many different things. The synonyms for the term childish are as follows: childlike, baby, innocent, adolescent, juvenile, and young.
not able to produce children or young synonyms: infertile, unable to reproduce / conceive, unable to have children / young, archaic - barren
old person, older, first, senior
the French translation for young man is "jeune homme"
They are synonyms.
Synonyms
Relative and kin are synonyms.