An-Nahl · 16:70

70. Allah created you without a precedent; then He will cause you to die when your term of life ends. The lifespan of some of you will be extended to the worst stage of life, which is the severe old-age, when a person will no longer know anything of what he used to know. Allah is knowing, and no action of His servants is hidden from Him. He is powerful and nothing can overpower Him.