What should someone do who fears death and judgment, and wishes they had never existed whenever they get older?

Remembering death is a good thing, commanded by Islamic law, and the fear of Allah must be accompanied by hope. Allah Almighty says: "And fear Me, if you are [truly] believers" (Quran 3:175). And He says: "And they hope for His mercy and fear His punishment" (Quran 17:57).

Let your fear be an impetus for action and diligence in obeying Allah, and know that the heart, in its journey to Allah, is like a bird: love is its head, and fear and hope are its two wings. It is recommended for fear to prevail during life and hope at the time of death, because fear drives one to strive diligently in good deeds.