Thing is: everything we do is killing us. Where we live with electricity is killing us. Just the act of eating is killing you.
On top of that, with millions of cells replicating every day there's always chance for one to go cancerous.
It's why we're in a race to get transhuman. We're not going backwards abd getting rid of electricity, cellphones, gmo food etc. We have to hurry and get transhuman or we'll probably die out.

Uh, avoiding drugs, alcohol and fast/bad food will probably get you at least 70-75yrs (excluding genetic disorders, cancer, etc).
We don’t HAVE to go transhuman. Those tech psychos want to find a path to immortality. That’s what that shyt is about.