We understand most of the mechanisms that result in aging at this point (telomere degradation, genetic losses, cell age…) And we know how to stop those things, but when you stop those systems you get cancer.
Essentially aging in animals is the direct result of cancer prevention, and while we can stop those aging mechanisms, the result is that you get cancer almost immediately because you’ve removed your defenses.
As such if we can come up with alternate cures for cancers we can then safely halt the aging process.
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