There. Some codices read "And there".
of days: i.e. of. few days.
child shall die. youth may die: i.e. neither early death, nor premature decay.
accursed. cut off. Compare Psalms 101:8.
Related Commentaries of Isaiah 65:20
Isaiah 65:20
20 There shall be no more thence an infant of days, nor an old man that hath not filled his days: for the child shall die an hundred years old; but the sinner being an hundred years old shall be accursed.