Now it is 82 years...Couple centuries ago, it was 30 years.
Depriving others of life is one of the great sins of mankind in general. Selfishly depriving people of nourishing food, by giving meager rations to slaves and free workers, and working them to death was common--especially in the pagan nations. If a child slave of slave parentage lived to adulthood in the Roman Empire, (and infant/child mortality was extremely high) his/her life would be shortened by overwork, poor nutrition and hopelessness.
During the industrial revolution, "Christian" factory owners would hire whole families (newly dispossessed of their subsistence farms) and then require 16-hour days of the adult workers, along with 12-hour days of children, six days a week. Often, their wages were so meager that they could barely afford to keep a roof over their heads and have enough left over for much food. They were packed into the rabbit warrens of inner city slums often right next to the factories which belched out smoke to fill their lungs. Tuberculosis was rampant and it was expected that infants born to tuberculous mothers would be bound to die.
Many Christians believed that the "Dust Bowl" conditions which struck N. America during the Depression was God's attempt to bring the people back to Himself after the decadence of the "Roaring Twenties". Many starved to death or were quite malnourished during those years. Disease and near starvation go together.
The reason why pestilence has always followed war is that food becomes scarce because of the shortage of workers in food production. That is one of the miseries of war that is rarely cited. The Nazis starved many of the Dutch to death directly, by taking away their food and firewood as did Stalin with the Ukrainians. He especially targeted Christians.
In the MK will be hundreds of years.
Yes, God will replenish the earth and all life within it, during the Millennial Kingdom. Isaiah said in chapter 65 that "only sinners will die at 100". But that is by the design and plan of God--no feeble attempt of man. Modern medicine has certainly extended life, but has it been very able to extend healthy life?
Genetic entropy is a fact. Geneticist, John Sanford, explains why he doesn't believe that mankind will ever be able to do successful gene tinkering to the point of "ending disease" in his book,
Genetic Entropy: The Mystery of the Genome. It is fairly accessible to the average reader. It seems that God never planned for mortal mankind to live forever in a world infected with the contagion of sin.