TL;DR
This is a mouse study, not yet tested in people, but it raises a question every future skin treatment will have to answer: does it work the same for men and women? A Brussels-led team followed single skin stem cells, which keep replacing skin, in living mice for five months. Females and males renewed their skin by different rules, sex hormones set those rules, and wounds on female mice closed substantially faster in the first few days. If human skin works like this, the creams and shots now in testing to rejuvenate skin might help one sex more than the other. The report, from a single source, gives no sample sizes, and the authors say it is unclear how closely mouse skin matches ours.
Below the line, for paid subscribers: The full story: where it stands, how we got here and what's dated next; our Odds board on 5 milestones, starting with "A skin-regeneration treatment tailored by sex reaches patients by 2040"; our labeled speculation on what it adds up to; and every source.