Sinclair is good at promotion (and self-promotion), but I would like to mention two other brilliant scientists who are not.
The first is Gregory Fahy, who works on thymus rejuvenation, and actually has a bunch of people (not mice), whose epigenetic clocks have turned back a bit, together with some improvements in physiology which indicate that the rejuvenation, albeit modest, was real.
The second is Juan Carlos Izpisua Belmonte, who works on cell rejuvenation using Yamanaka factors. He was already able to pull this off in living rats without killing them - a major success given that the Yamanaka factors aren't exactly safe.
The first is Gregory Fahy, who works on thymus rejuvenation, and actually has a bunch of people (not mice), whose epigenetic clocks have turned back a bit, together with some improvements in physiology which indicate that the rejuvenation, albeit modest, was real.
The second is Juan Carlos Izpisua Belmonte, who works on cell rejuvenation using Yamanaka factors. He was already able to pull this off in living rats without killing them - a major success given that the Yamanaka factors aren't exactly safe.