[MarkMc]

> He's still going to die within the usual human lifespan limits, just like the rest of us.

I'm not so sure.

For millennia people tried and failed to fly through the air like birds. In the late nineteenth century so many people had tried and failed, it seemed like a law of nature that humans were destined to remain earth-bound. Then suddenly, miraculously, we figured it out.

I think it will be the same with the 'usual human lifespan limit' of 120 years. At some point we will figure it out, and a group of humans will have a longevity distribution whose right tail extends to 150 years. Bryan Johnson may already be in that group.