Jeff Bezos is funding scientists who are reprogramming organs outside the human body.

Altos Labs removes the organ. Keeps it alive on a machine. Then runs rejuvenation therapy on it directly.
No patient risk. No waiting. Just a living organ, isolated, and reset.
It sidesteps the biggest problem in aging science: you can't easily test reversal therapies on humans without first knowing they're safe.
A perfused organ solves that.
$3 billion raised. Bezos in. The experiments are running now.
The body may be optional for what comes next.