https://nypost.com/2023/01/25/bryan-johnson-45-spends-2m-to-get-18-year-old-body/

Oliver Zolman, a 29-year-old physician who is heading up the medical team hired by Johnson, said his goal is to prove that a human being can reduce the medical age of each of their organs by 25%.

There is no person in the world who is 45 chronologically but 35 in every organ,” Zolman told Bloomberg News.

“If we can eventually prove clinically and statistically that Bryan has made that change, then it will be such a large effect size that it will have to be causative of the intervention and beyond what’s genetically possible.”