'Youths' in the Bible

youths in whom was no blemish, and of goodly countenance, and skilful in all wisdom, and acquainted with knowledge, and understanding science, and such as had ability in them to stand in the king's palace, and whom they might teach the learning and the language of the Chaldeans.

And the prince of the eunuchs said unto Daniel, I fear my lord the king who hath appointed your food and your drink; for why should he see your faces worse liking than the youths who are of your age? and ye would endanger my head with the king.

then let our countenances be looked upon before thee, and the countenance of the youths that eat of the king's delicate food: and as thou shalt see, deal with thy servants.

And at the end of ten days their countenances appeared fairer and were fatter in flesh than all the youths that ate of the king's delicate food.

As for these four youths, God gave them knowledge and skill in all learning and wisdom; and Daniel had understanding in all visions and dreams.