Still on the Azamara Journey, and should arrive into St. Johns by the time this posting is completed.  In a way, the roots of this series about the science to stop and reverse began with a posting on 8May2016, a decade ago, about how life began.   Then on 13June2025 I posted on DO YOU WANT TO LIVE FOREVER? On 19June2025 my posting was on Lifespan Limits .  I indicated that the Turritopsis dohrnii, the Immortal Jellyfish, might live for thousands of years.  So might, perhaps, hydra.  Something to do with FoxO genes.   But Homo sapiens ? You can read the details from that posting about these people in history who took extreme measures to live longer, but here are quick summaries of what they did. The first emperor of the Qin dynasty in China, Qin Shi Huang, drank mercury to live longer.  He died at the age of 49 in 210BC, which was then way over the life expectancy.  He was the one who had buried with him the Terracota Army of Xian.  By the...