These mice are brother and sister, born from the same litter. One has been genetically altered to be old. Now scientists say they have been able to reverse aging as well.
CNN  — 

In molecular biologist David Sinclair’s lab at Harvard Medical School, old mice are growing young again.

Using proteins that can turn an adult cell into a stem cell, Sinclair and his team have reset aging cells in mice to earlier versions of themselves. In his team’s first breakthrough, published in late 2020, old mice with poor eyesight and damaged retinas could suddenly see again, with vision that at times rivaled their offspring’s.