How could my immortal avoid degenerative diseases?

So my main character was genetically engineered to be biologically immortal.

By this I mean her DNA is a lot better than ours. The telomeres do not degrade over time same as genetic information. Cells can continue replicating forever.

Cancer is also not a problem because the DNA is altered to resist against radiation so cells will not mutate therefore aren't going to become cancerous.

please note I'm not that good at biology and have only watched a YouTube video on this and we only started learning basic biology at school last term so this could be wrong and sound really bad but the fact is, i am not going to go into a lot of detail in my story, this is rather for the benefit of me knowing this is scientifically plausible-well kind of anyway.

So I read on another question in one answer that an immortal is still greatly susceptible to degenerative diseases. The continuous use of the organism will result in deterioration aka degenerative diseases like heart diseases and dementia.

I want my character to be immune against these. The only way he should be killed is physically (head chopped off, burned, etc) note I know that he is also susceptible to pathogens but that's for another question.

Question What alterations or solutions would there be to stop this then?

posted over 6 years ago

user44784‭

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