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The hope, and my hypothesis, is that the young marrow can partially replace and possibly recapitulate functionality lost over time. The marrow contains stem cells for multiple systems, including blood and bone, so the thinking is that these cells can create a genotypically, and hopefully phenotypically, younger progeny. Transplanted marrow cells can expand and replace after ablation from chemotherapy, so the potential is there. Since it's your own cells, your body shouldn't reject them, and hopefully, they will slowly replace the older cells. Of course, the body might signal them to do otherwise, but to the extent that it doesn't, there may be benefit. I call it 'temporal transplantation therapy'. :)