From Sciencealert.com:
The clock is ticking on all our lives; we just don’t know when it will stop.
Scientists have devised a host of tools in their attempts to gauge biological aging – not just how many birthdays a person has had, but how worn out their organs and cells are. Many of these tools are epigenetic ‘clocks’, which tally chemical marks on DNA that accumulate with age and stress, but they aren’t always reliable. Now, researchers have developed a new clock based on gene activity that accurately predicts lifespan and captures hallmarks of chronic disease.