xenotransplantation modified supercentenarian stem cells

sometimes they modify tissues (like porcine tissue) to be immunoneutral so they do better at transplantation. taking stem cells from supercentenarians, then making them immunoneutral to other humans, then transplanting them could produce unusually long lived beneficial stem cyte effects, possibly as a new longevity technology

there is another version of this, where using a naturally dead giant cetacen, like a blue whale (some of which have been published as having muticentury longevity) do tissue culture on the cetacean tissue, modify it to be immunoneutral (something like changing external liposachharides) then using those stem cells as multicentruy lifespan new human repair tissues