I am just reading the book "Ageless Body, Timeless Mind" by Dr. Deepak Chopra.
He quotes Shankara: "People die because they see other people dying."
This means that we auto-condition ourselves to the experiences of aging, suffering, and death. Remove this auto-conditioning and your life will become longer, maybe forever.
It is true that plants and animals die. But they do not have inside themselves the power which God put into people, the power of their minds, the power of free choice.
Your body is the result of the signals which the cells send to the brain, which processes them. This processing of signals takes place through the "software" in our body. But the brain itself is exposed to shocks and changes and whatever. Who writes this "software?"
Obviously there is your eternal Self, well known to practitioners of spiritual yoga. Your Self can change the "software."
Science has already explained some mystic occurences. Science has shown how through
prayer and concentration we can change our DNA's, how we can heal ourselves...and many other things.
It is a world out there...and you can master it !