Ageing in human cells successfully reversed in the lab

This is like hundreds of similar articles I see every year. They managed in a lab to improve a particular genetic capability that seems to degrade with age. They improve it in the laboratory, then someone writes an overarching headline and it never goes anywhere.

In summary, their new work is an "exiting start". They find a way to deliver small doses of hydrogen sulfide directly to mitochondria with a "molecular postcode". This chemical is toxic in large doses but has been shown to "improve age related disease features in animals" [0].

[0]: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5964063/