Public health and medicine have added about 30 years to average life expectancy. The next challenge is to make those added years healthy ones. Geroscience is the field built around that goal: it treats aging itself as a risk factor that can be measured, and changed.
All three fields care about older adults. They differ in what they ask and where they intervene.
The broad study of aging and older people: biological, psychological and social. It covers everything from cognition and family life to retirement, housing and policy.
The medical specialty that diagnoses and treats illness in older adults, often managing several chronic conditions at once.
The study of the biological mechanisms that link aging to chronic disease. The premise is that targeting those mechanisms could delay many diseases at once, rather than treating them one by one.
Age is the single greatest risk factor for the majority of chronic diseases: neurodegenerative disorders, cardiovascular disease, stroke, cancer, metabolic disease and osteoporosis. Today we fight each of them separately, usually after it has appeared.
The gains in life expectancy over the last century came mostly from reducing early-life deaths, not from slowing how our bodies age. So for the first time, huge numbers of people are living beyond the point their bodies can maintain function. Geroscience asks whether slowing biological aging itself could push back many of these diseases together. That would compress the years spent sick into a shorter period at the end of life.
Three advances have turned geroscience from an idea into a practical science.
New molecular and AI-based measures can tell whether a person’s body is aging faster or slower than their chronological age. That lets researchers measure whether an intervention is working in real time, without waiting decades for disease to appear.
Genetic, nutritional and pharmacological interventions slow aging and extend healthy life in organisms from yeast and worms to mice and non-human primates. Several are now being tested in people.
The goal is not simply to live longer. It is to extend the years lived free of disease and disability, a “longevity dividend” for individuals, families and health systems.
The pace of biological aging differs between people and communities. It is shaped by nutrition, environment, stress and social conditions, so ZIP code can influence how fast we age. Geroscience must reduce these inequities, not widen them.
Our lab is a geroscience lab. We think a central biological driver of aging is the loss of metabolic flexibility, the ability to respond to changing nutrients. Dietary restriction preserves this flexibility and delays many age-related diseases at once. We are working out how it does so, so that the benefits can be achieved without the diet.
