Face Reconstruction with Fat Graft (Longevity)?

I am looking into reconstructing my cheeks (my soft tissue was lost after a trauma a few years ago). I have a question about longivity. Once the fat has a blood supply it is suppose to last a lifetime I believe. I know fat cells are always turning over (old ones dying and new ones replacing them). I want to know, whatever keeps this happening, will this also happen in my fat graft reconstruction. What is it that replaces the dying cells and were do there come from????

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