וְגַ֤ם עַד־זִקְנָ֨ה ׀ וְשֵׂיבָה֮ אֱלֹהִ֪ים אַֽל־תַּעַ֫זְבֵ֥נִי עַד־אַגִּ֣יד זְרוֹעֲךָ֣ לְד֑וֹר לְכָל־יָ֝ב֗וֹא גְּבוּרָתֶֽךָ׃
And even unto old age and hoary hairs, O God, forsake me not; Until I have declared Thy strength unto the next generation, Thy might to every one that is to come.
Read halakhic rulings (Jewish law) on Psalms 71:18 from the Mishneh Torah and classical halakhic sources, free online.