Charles Ellicott Commentary Isaiah 65:20

"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 a hundred years old, and the sinner being a hundred years old shall be accursed." — Isaiah 65:20 (ASV)

There shall be no more thence ... —The prophet sees in the restored city not so much an eternal and a deathless life as the return of the traditional longevity of the prediluvian and patriarchal age (Genesis 5:11). Life will not be prematurely cut off, as it had been, by pestilence and war. (Compare to Zechariah 8:4.) He who dies at the age of a hundred will be thought of as dying young; even the sinner, dying before his time as the penalty of his guilt, shall live out the measure of a century. The noticeable fact is that sin is thought of as not altogether extinct—as still appearing, though under altered conditions, even in the restored Jerusalem.