THE ARISING · Longevity & Healthspan
Bonn Lab Study Shows Blood Cells From Older Donors Lose Epigenetic Age in a Dish
Blood cells from very old donors can be converted in a dish into neural stem cells whose DNA-based age reads far younger, but nothing in this work turns back the age of a person. The widely quoted figure that cells from an 80-year-old reached a molecular age under 20 comes from press coverage, not from the study text we have.
The study, published in Aging Cell in 2026 by Berg and colleagues at the University of Bonn and partner institutions, is laboratory research on human cells. It did not involve animals or patients. The text available to us does not state how many donors were used. It says only that donors ranged from newborns to people aged 101.
The team took red blood cell precursors from donor blood. They added two genes, SOX2 and cMYC, using a virus. This pushed the cells to become induced neural stem cells, which can go on to form brain cells. Unlike the more common route, the cells did not first pass through a pluripotent stage, in which a cell can become almost any tissue.
To estimate age, the researchers used an epigenetic clock. This is a computer method that reads chemical tags on DNA, called methylation, which change with age. The tags do not alter the genetic code. They affect how often genes are read.
According to the study, neural stem cells made from older donors kept only about 13% of the donor's original age at low passages, meaning early rounds of cell growth. At high passages, meaning many rounds of growth, they kept about 5%. By our arithmetic, 13% of 80 years is roughly 10 years.
The new finding is about timing. The age reset was not instant. It continued for several weeks, and it continued even when conditions were set to block cell division. Differences in gene activity between young and old donors' cells also faded with more time in conversion. The authors say the established cell lines lacked ageassociated cellular hallmarks, much like cells made through the pluripotent route.
The cells also took a long time to settle into a true neural stem cell identity. According to the paper, that process went on well after the first cells with a neural stem cell marker, PAX6, appeared.
The press release, as carried by AZO Life Sciences, reports that cells from an 80-yearold came out with a molecular age below 20. It quotes Prof. Oliver Brüstle of the University Hospital of Bonn saying the slow pace makes it possible to "investigate which factors and active substances accelerate or slow down the rejuvenation process." The coverage's headline mentions 50 days, while its text says the change could be tracked for over 100 days. The study says only "several weeks," so the exact timeline is unclear from what we have.
For you
What does this mean for readers? Not much yet, and the limits matter. The study's own introduction notes that methylation age is a proxy for biological age. It is not a direct measure of how well cells work. The coverage says the rejuvenation makes cells "actually behave like young cells," but the study supports a narrower claim: the cell lines lack age-associated hallmarks.
The cells were also not the same cells that were taken from the donors. They were changed into a different cell type, grown in dishes, and treated with viral vectors. Nothing here shows that an aging body, or even an aging organ, can be reset. The study tested no treatment, drug or supplement.
The practical value is in research. A slow reset is easier to watch step by step than a fast one. It may help scientists find what drives epigenetic aging and whether it can be sped up or slowed down. Age is the main risk factor for diseases such as Alzheimer's, which is why Brüstle says the model matters for neuroscience.
The work was funded by the EU's Horizon 2020 programme, the German Research Foundation and Germany's federal research ministry, according to the coverage.
Next, watch for follow-up work that identifies which molecules speed up or slow the reset, and whether any of those findings hold up in living tissue.
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