AN NAHL — Ayat 70
وَاللّهُ خَلَقَكُمْ ثُمَّ يَتَوَفَّاكُمْ وَمِنكُم مَّن يُرَدُّ إِلَى أَرْذَلِ الْعُمُرِ لِكَيْ لاَ يَعْلَمَ بَعْدَ عِلْمٍ شَيْئًا إِنَّ اللّهَ عَلِيمٌ قَدِيرٌ
And Allah created you; then He will take you in death. And among you is he who is reversed to the most decrepit [old] age so that he will not know, after [having had] knowledge, a thing. Indeed, Allah is Knowing and Competent.
Tafsir Ibnu Katsir
وَاللَّهُ خَلَقَكُمْ ثُمَّ يَتَوَفَّـكُمْ وَمِنكُم مَّن يُرَدُّ إِلَى أَرْذَلِ الْعُمُرِ لِكَىْ لاَ يَعْلَمَ بَعْدَ عِلْمٍ شَيْئًا إِنَّ اللَّهَ عَلِيمٌ قَدِيرٌ
70. And Allah created you and then He will cause you to die; and among you there are some who are sent back to senility, so that they know nothing after having known (much). Truly, Allah is Knowing, capable of all things. Allah tells us that He is controlling the affairs of His servants. He is the One Who created them out of nothing, then He will cause them to die. But there are some of them that He allows to grow old, which is a physical weakness, as Allah says: