Charles Ellicott Commentary Daniel 1:10

"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 looking than the youths that are of your own age? so would ye endanger my head with the king." — Daniel 1:10 (ASV)

Of your sort, i.e., of your contemporaries, those who are of the same age with you.