Well, the bikeshedding part of the topic.

For some reason, any time we discuss extending human life, it quickly degenerates into an ethical question.

First, I wouldn’t worry about it because we spend more effort discussing ethics than actually trying to solve the problem. Basically, because the problem is so hard we bikeshed on ethics.

Second, it’s a very hard problem. It’s unlikely with the actual amount of effort, that we’ll be able to do much to extend life in the foreseeable future. We need to cure all the cancers, Alzheimer’s, heart disease, etc.