Transplants Reset Organ Biological Age

A preprint reports that hearts taken from older donors show molecular signs of 'rejuvenation' after transplantation into younger recipients, while young hearts in older bodies show accelerated aging signals; the effect was measured using biological‑age biomarkers in the transplanted tissue. The finding is preliminary (bioRxiv, not peer‑reviewed) but suggests systemic host environment influences organ aging. — If true, this would alter how we think about donor‑age risk, organ allocation, and the reversibility of age at the organ level — with implications for clinical guidelines and anti‑aging research funding.