John Trapp on Isaiah 65:20

Ver. 20. There ſhall be no more thence an infant of dayes] This verſe (as ſome others) had been eaſie, had not Commentatours made it ſo knotty. There ſhall be no more thence, that is, from Jeruſalem, ver. 19. an infant of dayes or a childe for dayes, viz. that ſhall ſo dye by an untimely death: for longevity is the bleſſing here promiſed.

Nor an old man that hath not filled his daies] That hath not lived his utmoſt, ſatur dierum, as Abraham.

For the child ſhall dye an hundred years old] i. e. He that is now a childe, ſhall live till he be ſo many year old. Note this againſt thoſe that otherwiſe underſtand the words, and have therehence fiſhed out many frivolous crotchets, too long here to be related.Hinc proverb. Puer centum annorum.

But the ſinner being an hundred year old ſhall be accurſed] And the more accurſed, becauſe ſo long-lived, and yet dyeth in his ſin; going down to the grave with his bones full of the ſins of his youth. See Eccleſ. 8.12, 13. with the Notes.