"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." Isaiah 65:20.

If an infant end its days quickly, yet it shall not be reckoned to die untimely; for the shorter its life is the longer will its rest be. They dying in the arms of Christ, and belonging to his kingdom, are not to be called infants of days, but even the child shall be reckoned to die an hundred years old, for he shall rise again at full age, shall rise to eternal life.

Matthew Henry