Are thy days as man's days? In short-lived man, shortsightedness and prejudice are excusable, but not in one whose days are unlike man's days—whose "years endure throughout all generations". Such a one ought to be above all human infirmity.
Or thy years as man's days? We should have expected "as man's years." But it marks the disparity more strongly to say, "Are thy years not greater in number even than man's [literally, 'a strong man's'] days?"