American and French researchers have developed a blood based epigenetic ‘clock’ that can estimate how well someone is aging, reflecting both physical and mental factors.

“In 2015, the World Health Organization introduced the concept of intrinsic capacity, defined as the sum of all physical and mental capacities that an individual can draw on at any point in their life. This concept promotes healthy aging by shifting the healthcare focus from treating acute illnesses toward measuring and preserving functional ability,” explains David Furman, a group leader at the Buck Institute for Research on Aging, and colleagues in Nature Aging .

Intrinsic capacity varies between individuals but in general peaks in early adulthood and starts to drop after midlife. However, it can be improved throug

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