The interpretation timeline
Zechariah 8:4 Douay-Rheims

Thus saith the Lord of hosts: There shall yet old men and old women dwell in the streets of Jerusalem: and every man with his staff in his hand through multitude of days.

1105 – 1875 6 witnesses

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“because of old age they will require the staff in their hand.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And the streets of the city shall be full of boys and girls,.... Denoting a large increase of inhabitants, in a literal sense; and may spiritually signify the large numbers of converts, of new born babes, who are regenerated by the grace and Spirit of God, and are accounted of by the Lord for a generation: playing the streets thereof; being in health and rigour, and in great security. The Targum renders it, "singing" or "praising in the spacious places thereof"; singing the praises of God in Gospel strains; saying their Hosannas to the Son of David; rejoicing in the great salvation by Christ, and magnifying the grace of God, and setting forth the glories of it in psalms, hymns, and spiritual songs; see Mat 11:16. In Jerusalem, literally taken, there were various streets, besides the street of the temple, which led to it, Ezr 10:9 mention is made of others in Jewish writings, as of the upper street (k), and of the street of the butchers, and of the street of those that dealt in wool (l). (k) Misn. Shekalim, c. 8. sect. 1. (l) Misn. Erubin, c. 10. sect. 9.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“There shall yet old men and old women - In those happy times the followers of God shall live out all their days, and the hoary head be always found in the way of righteousness.”
1863
A.D.
1796–1863
“Lit M On account of the multitude of days." " So great will be the general prosperity, on My re- turning to Sion, and so great the rest and security from war, that as no enemy shall remain behind, persons of each sex will reach extreme age, and support their tottering limbs with the staff." St Jerome.”
1871
A.D.
1871
“So tranquil and prosperous shall the nation be that wars shall no longer prematurely cut off the people: men and women shall reach advanced ages. The promise of long life was esteemed one of the greatest blessings in the Jewish theocracy with its temporal rewards of obedience (Exo 20:12; Deu 4:40). Hence this is a leading feature in millennial blessedness (Isa 65:20, Isa 65:22). for very age--literally, "for multitude of days."”
Source
1875
A.D.
Keil & Delitzsch Lutheran
1861–1875
“Zac 8:4. "Thus saith Jehovah of hosts, Yet will there sit old men and women in the streets of Jerusalem, every one with his staff in his hand, for the multitude of the days of his life. Zac 8:5. And the streets of the city will be full of boys and girls playing in their streets." Long life, to an extreme old age, and a plentiful number of blooming children, were theocratic blessings, which the Lord had already promised in the law to His people, so far as they were faithful to the covenant. Consequently there does not appear to be any Messianic element in this promise. But if we compare this fourth verse with Isa 65:20, we shall see that extreme old age also belonged to the blessings of the Messianic times. And as Israel had almost always to suffer most grievously from wars and other calamities, which swept off the people at an untimely age, during the time which extended from Zerubbabel to Christ; it must be admitted, notwithstanding the description of the prosperous times which Israel enjoyed under the government of Simon (1 Maccabees 14:4-15), that this promise also was only fulfilled in a very meagre measure, so far as Jerusalem was concerned, before the coming of Christ.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.