The exposome
In 2005, an epidemiologist named Christopher Wild gave a name to the half of health we had never learned to measure: the exposome, the sum of everything that gets into us over a lifetime. The air, the water, the food, the light, the stress, the sleep, even the people around us. He called it the environmental complement to the genome. For two decades it stayed mostly a concept, because exposures are a moving, lifelong stream that no clinic or study could keep up with. That is finally changing.
What the evidence says
A 2026 study in Nature Medicine tested hundreds of exposures against hundreds of health measures across two decades of data. No single exposure explained much. Taken together, the exposome explained more of people's health than genetics did for the majority of traits, and for chronic inflammation, the slow driver beneath much of modern disease, the exposome outweighed genes by roughly five to one. A separate analysis of nearly half a million people found that the combined set of everyday exposures explained more of who lived and who died than genetic risk did, and that most of those exposures were things people can change.
How Exposure Age works
Exposure Age turns your exposome into a single number you can see and move. It weighs the forces aging you against the forces protecting you, and personalizes the result to your life. It is built in layers. Modeled: it can start from what is knowable about where and how you live. Personalized: it sharpens as you connect the data you already generate. Measured: it sharpens again with optional biology. Each layer makes the number more truly yours.
What it is, and what it is not
Exposure Age is a personalized estimate that gets more precise over time. It is a guide, not a verdict. It is not a diagnosis, not a clinical lab value, and not a promise about any one person's future. The science of measuring the exposome at the individual level is early, and we will always be clear about the difference between what is well established and what is still emerging. That honesty is the point.