Cellular Reprogramming: Did 53-Year-Old Skin Cells Turn 23 Again?

I'm Dr. Hongseok Kim, a board-certified dermatologist with 21 years of practice and the medical director of VOS Dermatology Clinic in Gangnam, Seoul, right in front of Dosan Park. At VOS I see every patient myself, from the first consultation to the last treatment.

When I read that 53-year-old skin had been turned back to 23, I wanted to know what was actually done, so I went to the paper. The idea behind it is cellular reprogramming: resetting the age of a cell itself rather than repairing the damage. This page is based on my YouTube video from August 2026; I rewrote it for readers abroad. The video above can be watched with translated captions.

The video title says anti-aging is over. My actual conclusion is more careful, and I explain why below.

What did the "53 becomes 23" study actually do?

Short answer: a 2022 lab study partially reprogrammed aged skin fibroblasts and found their age markers had moved about 30 years younger.

The paper was published in 2022 by researchers centred on the Babraham Institute in Cambridge (in the video at 00:32). The cells they used were fibroblasts from the dermis. I describe fibroblasts as a factory: they make collagen, hyaluronic acid and most of the other components of the dermis.

Cells age too. Over time, senescent fibroblasts appear; production drops, function changes and the cells start releasing various substances. The question the study asked was simple: can a collagen factory that has already aged be made young again (in the video at 01:06)?

What are Yamanaka factors, and why stop the reset halfway?

Short answer: four factors that can reset a fully specialised cell back to an early state, like a factory reset on a computer.

In 2006, Professor Shinya Yamanaka of Kyoto University published research in the journal Cell (in the video at 01:26). Our bodies start from stem cells that gradually specialise into skin, muscle or nerve. Once a cell has become a skin cell, it normally stays a skin cell for life. When four factors were introduced, fully specialised cells returned to their early state. Those four became known as the Yamanaka factors.

Think of an old computer that has slowed down after years of installed programmes. A factory reset makes it clean again. The catch is that a full reset also wipes the programmes and data (in the video at 02:44). For a cell, a full reset would not just make it younger; it would lose its identity, forgetting that it was ever a skin cell.

Partial reprogramming is the answer to that problem: the goal is to turn the cell's age back without erasing what kind of cell it is, so researchers switch the factors on only temporarily. That is partial reprogramming: you press the reset button but take your finger off before it finishes (in the video at 03:16). In the video I walked through the steps that led to the 2022 paper:

• 2016: a mouse study switched the Yamanaka factors on and off rather than leaving them on, and several features of ageing improved; it was published in Cell (in the video at 03:26).
• 2020: research on aged human cells showed that switching the factors on temporarily could shift ageing-related markers and functions in a younger direction.
• 2022: this paper pushed further with an approach called MPTR, maturation phase transient reprogramming (in the video at 04:03). The reset is started, stopped before it completes, and the cells return to being fibroblasts, now looking younger.

How do you measure a cell's age?

Short answer: with an epigenetic clock, which reads age-related chemical marks on DNA; it estimates biological age, not the years a cell has lived.

You cannot ask a cell for its date of birth (in the video at 04:33). Picture DNA as a very thick cookbook. Skin, nerve and muscle cells carry much the same book, but they open it at different chapters. Over the years, marks build up on the pages, a bit like sticky notes added one by one.

At certain DNA sites these changes follow a fairly regular pattern with age. This is DNA methylation, a small chemical tag on a specific part of the DNA (in the video at 05:41). Researchers collected methylation data from people in their 20s through 60s and built clocks that predict the age of tissues and cells; the well-known one is the Horvath clock.

The important caveat: the age this clock gives is not chronological age, the time actually lived (in the video at 06:21). It is closer to biological age, how far a cell has aged. So "53 became 23" really means that the molecular age markers measured in skin fibroblasts moved about 30 years in the younger direction, a substantial rejuvenation of epigenetic age.

Did the cells actually work like young cells?

Short answer: yes, in the lab, and to me this mattered more than the 30 years; collagen production and cell movement shifted towards those of young cells.

Changing the birth date on your ID card does not make your body younger (in the video at 07:19). Young-looking cells need to work like young cells too. When the researchers looked at the proteins involved in making collagen, production had recovered towards the level of young cells. They also measured how the cells moved, and that too moved in a younger direction (in the video at 07:43). The cells were not just younger on paper.

Can cellular reprogramming be used on my face?

Short answer: no, not now; this was research on cultured cells, and the hardest problem, where to stop the reset in a person, is unsolved.

The obvious next thought is to apply Yamanaka factors to the face (in the video at 08:17). But these were cells grown in a laboratory, and no clinical data from treating people were presented. If you used a reset button in a person, could you know exactly when to stop? I compared it to a fountain of youth in a cartoon: drink a cup and you get younger, but drink too much and an adult turns into a child. And one person might get ten years younger from a cup while another, who reacts more strongly, loses twenty. Because the response could differ so much between people, it is very hard to evaluate (in the video at 09:02).

So this is not a treatment you can book, at VOS or anywhere else.

Is the anti-aging era really over?

Short answer: not yet; today's treatments repair the old factory, while reprogramming would rebuild it, and that is a possible future direction, not today's option.

Epigenetics is about which pages of the DNA book are opened and closed. My view is that injections and other skin procedures also change that environment a little at a time (in the video at 09:16). When I compare patients who care for their skin consistently with those who don't, the difference is clear, and I think part of the reason is that this epigenetic side keeps being nudged. I believe care can influence how skin ages, although the amount differs from person to person.

Current rejuvenation is like maintaining a 50-year-old factory: cleaning it, replacing worn parts and getting it to run more smoothly (in the video at 09:54). A treatment such as Rejuran, a PN skin booster used to support fibroblast activity in the dermis, belongs in that category; it helps ageing skin repair itself, but it does not reset the age of your cells. Reprogramming with Yamanaka factors would turn the old factory into a brand-new one. I cautiously think it could become one direction for the future, and if it ever becomes safe in people, we may start saying "age reversal" instead of "anti-aging" (in the video at 10:30).

For how I combine today's options, see my overview of how I layer Korean anti-aging treatments and my guide to Korean skin boosters. My video note on what I think is realistic in reverse aging looks at young blood, stem cells and daily habits. You can also read creator experiences at VOS.

Results, timing and recovery vary from person to person, and the right plan for you is decided at an in-person consultation.

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Results, swelling and recovery vary from person to person. This page is general information from VOS Dermatology Clinic based on Dr. Kim's video and does not replace an in-person consultation.