Yâ Sîn
IN THE NAME OF GOD, THE MOST GRACIOUS, THE DISPENSER OF GRACE[36:68]
But [let them always remember that] if We lengthen a human being’s days, We also cause him to decline in his powers [when he grows old]: will they not, then, use their reason?

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* v.68 : I.e., man should never postpone his exercise of moral choice – for if human beings are superior creatures inasmuch as they have been endowed with the faculty of discernment and a wide measure of free will, let them also remember that “man has been created weak” (4:28) and liable to decline still further in old age, so that the time at his disposal is short.