Researchers reprogrammed blood cells from an 80-year-old donor into stem cells that read out a molecular age under 20.
The team converted the donor's blood cells into induced pluripotent stem cells, the standard technique for coaxing adult cells back into a blank, embryonic-like state. They then measured the resulting cells with an epigenetic clock, a test that estimates biological age from chemical markers on DNA, and the readout came back under 20, a roughly 60-year drop from the donor's actual age. The study appears in the journal Aging Cell. It joins a growing body of reprogramming research showing that pushing adult cells back to pluripotency can reset at least some epigenetic age markers, even in cells taken from elderly donors.
Epigenetic clocks are proxies, not direct measures of function. A cell can score young on a DNA-methylation test without anyone confirming it behaves young in other ways, like dividing cleanly or resisting cancerous growth. The study doesn't establish whether these cells shed other hallmarks of aging, such as mitochondrial damage or protein buildup, or whether they'd be safe to use therapeutically.
Until reprogrammed cells demonstrate youthful function beyond a clock reading, this is an interesting data point, not evidence of reversed aging.