Translation
in the day when the keepers of the house tremble, and the strong men are bowed low, and
when the grinders cease because they are few, and those looking through the window grow dim,
Paraphrase
in the days when the arms which once provided for the household won’t stop trembling, and
the back which formerly was strong and rigid is bent and stooped, and
when the teeth can no longer chew because there are so few of them, and
the eyes that once looked through the windows can no longer distinguish shapes,