Surah An-Nahl 16:70

وَٱللَّهُ خَلَقَكُمْ ثُمَّ يَتَوَفَّىٰكُمْ ۚ وَمِنكُم مَّن يُرَدُّ إِلَىٰٓ أَرْذَلِ ٱلْعُمُرِ لِكَىْ لَا يَعْلَمَ بَعْدَ عِلْمٍ شَيْـًٔا ۚ إِنَّ ٱللَّهَ عَلِيمٌ قَدِيرٌ

And Allāh 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, Allāh is Knowing and Competent.

Translation: Saheeh International

Tafsir

And God has created you when you were nothing then He takes you in death when your terms of life are concluded; and there are some among you who are relegated to the most abject stage of life that is the most diminished because of old-age and senility so that he knows nothing after having possessed some knowledge. …

Excerpt from Tafsir al-Jalalayn, commentary on 16:70, via Quran.com. The reader has the full commentary and 9 more tafsirs.