It's not God's will for anyone to die young, and bible clearly tells us that man will live 70-80 years (Psalm 90:10). All godly man (like Abraham, Moses, Joshua, Elijah etc) in the bible were died in their old age. But many believers don't believe this, and during their health crises instead of believing for healing, they start thinking it's God's will for them to die.

     If you are one of them please don't think like this, because God will not call you until you are ready with full of your age. You just fulfill your assignment given by God. When your time/ assign work will over and you feel ready to go, then go with satisfaction of rest in heaven (2Timothy 4:6-7).