Removing damaged cells that age us and promote disease can undo the ravages of old age.
Researchers have developed a molecule that selectively destroys these so-called senescent cells.
The molecule, known as FOXO4 peptide, makes old mice act and appear more youthful, giving hope that it may do the same for people.
This peptide prompts senescent cells to commit suicide. But it spared healthy cells.
When mice were treated with the substance, their fur regrew, kidney function improved and they were able to run twice as far as untreated elderly animals.