Science Has Been Asking the Wrong Question About Aging, a New Perspective Contends

A new perspective published in Biogerontology challenges one of the most persistent assumptions in aging research—that aging stems from a single, identifiable biological mechanism. The article, authored by Dr. Piotr Chmielewski of Wroclaw Medical University and titled offers a critical appraisal of contemporary biogerontology and argues that the field may need to fundamentally rethink how it frames the question of aging.

As recently as the mid-20th century, Nobel Prize laureate Peter Medawar described aging as "an unsolved problem in biology." Since then, scientists have uncovered the importance of the mTOR, AMPK, FOXO, and IGF-1 pathways in regulating growth, metabolism, and lifespan; developed epigenetic clocks based on DNA methylation patterns to estimate biological age; and identified genetic variants associated with longevity. Yet Dr. Chmielewski argues that this progress has revealed complexity as much as it has delivered answers.

"We understand individual mechanisms of aging increasingly well, yet we still do not know whether they form one common process or a set of partially independent processes leading to similar outcomes," he writes.

For decades, proposed primary drivers of aging have included oxidative stress, DNA damage, telomere shortening, mitochondrial dysfunction, epigenetic changes, and chronic inflammation. Each explains part of the picture, but none accounts for all age-related changes. "All of these processes play an important role, yet none appears to explain the phenomenon in its entirety," Dr. Chmielewski notes. "Research shows that aging resembles the gradual disorganization of a complex biological system rather than a single failure resulting from one defect or program." 

The perspective also raises questions about epigenetic clocks, one of biogerontology's most celebrated tools. While they can estimate biological age and are associated with disease risk and mortality, a fundamental question remains: "do epigenetic clocks measure processes that directly participate in aging, or do they primarily reflect changes caused by other biological mechanisms?"

On the translational side, Dr. Chmielewski cautions against over-interpreting animal studies. Laboratories regularly report interventions that extend mouse lifespan by 20–30 percent, but "a mouse is not a miniature human," he emphasizes, pointing to fundamental differences in lifespan, metabolism, immune function, and repair mechanisms.

Rather than focusing on eliminating damage, the perspective suggests that what distinguishes a young organism may be its capacity to cope with it. "Perhaps the most important characteristic of youth is not a low level of damage, but a high capacity for adaptation, regeneration, and response to stress," Dr. Chmielewski writes.

The review concludes by proposing a shift in the central question of aging research—from "What causes aging?" to "How do some organisms manage to maintain functionality, resilience and adaptive capacity for so long despite constant damage and disturbances?"