Has anyone considered with all this scientific of human/ animal experiments, that possibly the mingling of human DNA with the fallen angelic like as in the time of Noah, but now more advanced could be the marking of the beast. Therefore no one can die even if they wanted to because of angelic DNA mixed in. Look up the kjv of nebakanezzer statue of the last kingdom to arise " THEY shall mingle THEMSELVES with the seed of men" Daniel 2:41-43

Nebakanezzer image - great teaching by pastor Mike Hoggard