There is no physical/chemical/biological reason you can’t live indefinitely with the health and vitality of a 25-35 year old. Aging isn’t a law of nature.
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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