[riggins]

I'm sad this comment hasn't been upvoted higher. The comment explain how the mutation could be possible.

The key is that the mutation would prevent reproduction. If you never age, you never reproduce.

You can think about different cancers. A mutation that causes fatal childhood cancer doesn't get passed on. A mutation that causes prostate cancer can spread.

[James_Henry]

Aging/death and reproduction seem to be closely related. I suppose maxander would counter that some mutation, given the many people who have lived before, should preserve reproducibility and youthfulness if fractional plasma is able to, but I'd counter that maxander is measuring (or guessing really) the probabilities wrong.