IIRC there was a doctor posting in other threads about his bone-marrow stem cell banking startup. My understanding was that these stem cells were stored when yo

IIRC there was a doctor posting in other threads about his bone-marrow stem cell banking startup. My understanding was that these stem cells were stored when young, and could be multiplied in a lab environment and then re-injected therapeutically (to cure MS or arthritis or whatever). Would these kind of banked stem cells (say, banked in one's early or late twenties) also potentially assist with life extension?