Stanford scientists regrow lost cartilage and reverse arthritis in major breakthrough
(www.sciencedaily.com)
No worries about that, there is no changing the maximum age seemingly, not unless you genetically engineered babies with tech we don't have yet.
Everyone is born with stem cells that carry so many copies of cells that are preprogrammed to die after a point to then be replaced by those stem cells. No drug can make more copies after the fact.
Then of course the dna gets denatured just by radiation and pollution and time.
Neither of these will or can be solved after someone is born. They can extend the average lifespan of a group, but they can't exceed the maximum, which has remained constant throughout human history even as the average has changed drastically.