It out of my wheelhouse but isn't telomeres a physical/chemical/biological reason we can't live forever?
It’s one component, but not the only reason [1].
Naked mole rats’ telomeres do “not shorten with age but rather showed a mild elongation” [2]. They are long lived, for rodents, and don’t degrade into balls of cancer [3]. They nevertheless age.
[1] https://en.m.wikipedia.org/wiki/Senescence#Theories_of_aging