כֹּ֤ה אָמַר֙ יְהוָ֣ה צְבָא֔וֹת עֹ֤ד יֵֽשְׁבוּ֙ זְקֵנִ֣ים וּזְקֵנ֔וֹת בִּרְחֹב֖וֹת יְרוּשָׁלִָ֑ם וְאִ֧ישׁ מִשְׁעַנְתּ֛וֹ בְּיָד֖וֹ מֵרֹ֥ב יָמִֽים׃
Thus saith the LORD of hosts: There shall yet old men and old women sit in the broad places of Jerusalem, every man with his staff in his hand for very age.
Read Jewish philosophical commentary on Zechariah 8:4: and classical philosophical sources.