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Great. You've defined them both.
Now, in what way are those things different?
They are the same. There is no separation going on, as far as I can tell.
Treat all molecules and subatomic particles within the same field of view, and the solution is obvious.
Muscles might get worn out. But the human brain is an organ capable of complete self-sufficiency; really... if someone really doesn't want to die, from the depths of their being, their brain has the ability to respond to practically any stimuli, figure out exactly what actions are necessary, exactly what their organs--including their brain--need to do, exactly how to distribute already-present chemicals, exactly how to improve and adapt varius functions, and achieve permanent contextual "immortality."
You are correct on one point, though: stem cells are inadequate.
OH MY GOD
the population would just grow non stop and the planet itself would not be able to handle.
"It would really be horrible if humans became immortal"
The transience human life is the exact reason for the overproduction...