وَمَن نُّعَمِّرْهُ نُنَكِّسْهُ فِي الْخَلْقِ ۖ أَفَلَا يَعْقِلُونَ (68)
(36:68) Whomsoever We grant a long life, We reverse him in his constitution. *57 Do they still not understand?
*57) "Reverse him in nature," means that in old age Allah turns him back to the state of childhood. He becomes unable to stand and walk without the help and support of others; he is fed by others; he urinates and defecates in bed; talks childishly and is laughed at by others. In short, towards the end of life he returns to the same state of weakness with which he had started lift in this world."