'Young' in the Bible

and Zadok, a young man mighty of valor, and of his father's house twenty and two captains.

And David said, Solomon my son is young and tender, and the house that is to be builded for Jehovah must be exceeding magnificent, of fame and of glory throughout all countries: I will therefore make preparation for it. So David prepared abundantly before his death.

And David the king said unto all the assembly, Solomon my son, whom alone God hath chosen, is yet young and tender, and the work is great; for the palace is not for man, but for Jehovah God.